Matt,

Should be pretty successful. I've used my CSP2 and CSP2+ with several solid state amps with success. Now I have to say that I prefer a tubed integrated alone or with a tubed preamp, i just really never settle into a system with solid state at the amplification stage. In fact I tend to favor a position that is not the most popular one: I've found a solid state preamp into a tubed amp a bit preferable.

You will get a good dollop of the Decware magic sound using one of Steve's preamps into your amp. But just know it's not quite the same as the all tubed Decware system would be. . . .

Like many who used SS all their lives, I took the timid first step into using tubes by getting a good tube preamp.  That gave me better music and the guts to start looking at tube amps.  After hearing the Torii MK III with my speakers all doubt was erased.  

I was quite shocked to learn I wasn't getting good bass despite having 500 watts/ch.  My speakers are so much better than I had thought, and I liked them a lot before this epiphany.  After extensive reading I now attribute restricted bass to my SS amp's high damping factor >600.  I have woofers in sealed enclosures that already control the cone movements effectively.  Over damping is just constricting the bass.  

Hopefully you don't have that issue, but you likely aren't getting the fluid sound of tubes.  That is a matter of taste and only your ears can decide if that is what you want.  Everyone on this site does.

If you really like the Vandees, and I suspect there is more in them also than you know, I would get the Torii MK IV or the Mystery amp.  Taking the slower path like me, get the Decware preamp.  It will move you in the right direction and would not have to be a throw-away move.  Do check the impedance match however.  What is the input impedance of your mono blocks?  If they are 50k or higher you should be ok.  If not I would give Steve a call and get his opinion.  A poor match will result in roll off on the frequency extremes, more noticable with bass.  

Scott