That's a shame if the Vincent SA-T8 is now unavailable in the States. I havn't heard the SA-T7. Reading about it it's only Single Ended with a couple of digital inputs included. As it rained all day in Mebourne, I've just been playing around with some of my equipment, and confirmed what a truly great Pre the SA-T8 is. As good as the massively upgraded AR SP9 is (think the jump from Mk.11 to 111, and then the same jump again, to what I call Mk. 1V). It has beaten out some highly regarded Pre's. And the highly regarded "giant killer" Doge 8 (with upraded tubes), which is a nice Pre. I was enjoying both Pre's. When I put the SA-T8 back in the system, I was almost speechless. It is in another stratosphere (better). I still have the stock tubes in! With upgraded tubes and possibly a couple of tweaks, who knows what the Vincent is capable of?
Anyway good luck kalali, hope you find something really nice.