Have you heard of Omega Loudspeakers?  Another US made designer that pairs nicely with Decware.  They are a single driver design and I am really digging the sound of mine and find I have no need for a sub.  They are very reasonably priced as well.

Here is a review of the Super 6 Alnico on John Darko's site.  The Omega's were Darko's first review to ever receive a Dar-KO award.  The Super 6 is Omega is top of the line speaker in his line up, but I have a custom pair that use the Super 3s cabinets with his new Model 7F drivers and I like the combo a lot, they are super efficient 95 dB - no crossover - single driver speakers that are driven by a Decware Taboo MKII @ 6 watts and they can get really loud before I even hit halfway on the volume knob.

I'm going to get scoffed at here...but the proof is in the listening.  I have some very good sounding speakers in my stable right now, 5 pair, each being a radically different "design".  They range from conventional sealed box, dynamic drivers to electrostats, to full-range, high-efficiency, single-driver DIY's, to open baffles and even a vintage horn-loaded Klipsch, i.e. Chorus II's.  
The subject of "bass" is very subjective.  What most people are actually talking about is "weight" thru the mid-bass region and not bass extension into the "sub" bass range.

Nobody would believe this (including myself), until they heard it - but my single, full-range, high-efficiency drivers(12" Audio Nirvana Super Cast Frame Alnico's ) in a 5.6 cu/ft ported box have bass "weight" like no other speaker I've ever owned or heard.  It really has to be heard to be believed.  HOWEVER... this is only true when they are driven by my Torii MK.III.  There is something going on here in terms of synergy between these drivers, no crossover parts at all and the Torii that defies logic, experience and physics.  This combo has dumbfounded everybody who's heard it so far.  I do have a "frame of reference here" as I have twin Velodyne Optimum 12 subs, that I used with my ML Vista's(which measure essentially flat to 40hz in my room without a sub).  But this setup does not have the "weight" of sound of my DIY's.  Its hard to verbalize, but once you hear it, you know it immediately.  No the DIY's do not do "sub bass" - but they do everything else and they do it about as good as it gets in my experience.  Near electrostatic transient speed, dynamics and detail with a fluid realism no other system I've ever owned possessed.  I want to again stress, this is only with the Torii driving them.  Hook up a solid-state amp, even very good, highly respected ones, think Levinson.. and they are dry, forward, etched, lack weight and bass.  Hook up the Torii... in a double-blind you would swear you were listening to totally different speakers - radically different.

I've heard the Decware HR-1's at Decware... very nice speakers.  But I would have to hear them in "my room" before I laid down that kind of long green..  but they might very well be what you're looking for.

If you are into DIY'ing just a bit, and don't want to spend piles of $$$ unnecessarily - at least not at first.  See if you can find a vintage pair of Klipsh Forte II's or Chorus II's in good shape.  If you're willing and able to spend a few $$ and some of your time to redo the xovers in these, replace the tweeter and midrange compression driver diaphraghms with the Crites and a little tweaking - driven by a Torii - they will stun you.  Do not get Chorus' unless you have a huge room for them, otherwise the bass will overpower the room and the Chorus' will sound out of balance, heavy and too dark - try the Forte instead.  Some of the newer Klipsch models may work well also - but the ones I've heard, are not as good as the old ones - to my ears.

If you have some intermediate wood working skills and the equipment (or a friend who does), get some Audio Nirvana drivers and put them in a well braced reflex box of 5.6 cu/ft. or larger - strap on a Decware Torii - stand back and prepare to be amazed!!!  Take the $$$ you saved and buy music or setup a nice music-server front end... then just sit back and enjoy!!!

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I'm thinking this for the single driver Omega's as well for some reason.  I have a Rega Brio-R @ 50 watts and also the Taboo MK II @ 6 watts ... with the Taboo the bass is weightier (is that a word) than the Brio-R.  I still think the Brio-R is a great little integrated (with that PRAT thing Lon always talks about ) and will use it once in a while, but it's out-classed by the Taboo.

I can't speak exactly to the use of the CSP2+ or CSP3 with the Torii, as I do not have a CSP.  At last years Zenfest, we heard the Torii with and without a preamp.  I think it will be something you'll have to try in your system and hear for yourself in order to be able to determine your preference.

I have used my Torii MK.III both ways - no preamp, driven directly by my Wyred4Sound DAC-2, which has volume, balance, mute, phase, input select, etc. all available via remote.  This was a synergistic combo for sure.  But... I have some analog sources also, so some kind of a preamp is a must for me.  I have an over-achieving, not well known SS preamp I have owned for several years that I have been quite content with in the other systems I've had.  I put this preamp in front of the Torii, and "discovered" just a smidge of "grunge" that had never been revealed to me before with other amps I used it with.  So be prepared for the "transparency" of the Torii <-- fluid resolution is the best verbiage I can come up with to describe the Torii.

So... this put me on another quest for a new preamp.  Listening to music, for me, is practically a "therapy".  It's how I unwind from the insanity that is large corporate America these days.  So when I sit down to listen to music, its to relax.  I don't want to be jumping up every cut to adjust volume - remote control "Is a Must".  If Steve would make a remote controlled CSP, I'd be "on it" like white on rice.  So.. finding a remote controlled preamp, that doesn't muck up anything can be a bit of a chore.  And it would be "icing" if said preamp, also brought some additional sonic desirables to the table.  Steve will tell you that putting a CSP (or any good preamp) in front of the Torii can be "a good thing".  It just depends on several factors.  But a preamp can sometimes add "weight", flesh-on-the-bones, dynamics, bloom, etc.  And a good one, won't sacrifice any of the "rez" of your amp or muck anything up.

Long story short, I think I found a preamp that meets all the criteria outlined above that are important to me.  I've only had it a few weeks and have been doing some dialing-in of its sound with some tube rolling, but it's showing great promise already.  It definitely doesn't have any grunge, meets all my functional requirements, and even brings some additional goodness to my sonic landscape.  This last point is still a moving target at this point with the auditioning of different tubes.  Bad news is; this preamp costs more than my Torii !!!!