I cannot vote because I don't know enough about these 2 amps to decide between them. I did have that Tekton Design speaker you have. I found it to be too "shouty" and ultimately fatiguing; in addition, it was not real good in the bass.

A pair of Steve's DM944's would kick the Tektons in the a**.

Synergy will play a huge part in what you decide here. I have heard both amps a number of times on a number of different speakers. The SE34I.2 seems to be a little less user friendly than the SE84C but every time I have heard it set up well it has seemed to shine. With one SE34I.2 you wouldn't need to worry about getting a second amp later as it will definitely get the job done. There are, of course, other options such as the mini-tori etc. I have a personal preference for the SE34I.2 after hearing an excellent match with a custom speaker a couple of years ago with this amp and some tube rolling.

As for the speakers, I like the sound of the Fostex drivers in several different types of cabs. I know Bob has some mods he has done to the little FE126 that erased some of the shoutiness and made them sound smooth as silk.

Certainly not enough experience here to say what is best for you, but I can say my preference. Of course, considering the speaker at hand and not knowing if you intend to keep those forever makes a difference. Bob and Steve would definitely be able to tell you which is a better match. The SE84 is very, very forgiving and smooth which might help if your speakers are somewhat too bright or shouty???

Good Luck,
Robert

If those are 4 ohm speakers, the SE84 would be better.  I believe that the integrated's output tranny's are better for 8-16 ohm loads.  Steve would probably concoct either model to meet your needs, so give him a call if you haven't.  

I have two SE84's and 92db rated, somewhat low impedance speakers.  With just one SE84 driving, absolute output and peaks are only in the low 90's in room at best.  With two as monoblocks that gets upped to the high 90's, which unless you're a teenager should be plenty.  We're talkin mid-size room and mid-field listening distances, so ymmv, just wanted to indicate my biases.  

Check this out...a fairly glowing review of the integrated, and the author uses a zen select as his reference amp.  Good comparison and info that would probably help you decide:
http://www.tnt-audio.com/ampli/decwarese34i_e.html

Though it is all so relative and synergy of room, gear and listener so critical, I can tell you my experience. I have a SE34I.2+ and Decware MG944 speakers in a medium sized room. The speakers I had before were rated and 90db and 6ohms. With the 6 watt amp, I found them OK on louder recordings but too quiet to give me a full musical experience on many recordings, and downright unacceptable for DVDs.

So I got some MG944's (94 Db/4 ohm) and they pretty much solved these issues for me if I use the higher gain 6N2P input tubes. However, if I use 6N1P or 6922 types, music is good, but the DVD thing (quieter player than CD) is less than engulfing for us.

I love the sound of the SE34...liquid, smooth, revealing, musical....and there are many ways to adjust its sound with settings and tubes, so would be surprised if you did not like its sound after breakin and tuning it to your tastes. I think it is unbelievably good.

However, and I may be a loud listener (though I am far from a teenager) but I like to load the room with enough sound to make me "feel" all aspects of the instruments and performance. My ears are still very good though and I don't intend to damage them! I can't find my DB meter, so can't say how loud I play, but I regularly listen for hours without fatigue. I find I do run the 34 close to its distortion limit fairly often though, and when I am liking tubes other than the 6N2P (nice tube) I don't like having to trade back to them in order to get DVD's loud enough for our tastes.

Considering these two points, with my room and 94Db/4ohm speakers, I am taking this beautiful sounding piece of gear to its limits often, and I realized I would be better served with a Torii MkIII. On the very edge of that need, but I decided I would be better off with more headroom. Good Luck.