I would also echo the use of the CJ solid state (Motif and MF series), as the others have, I should have mentioned them earlier. And if you can get one of CJ's earlier Premiere tubed amps, you might not care about some slightly weaker bass!
Unsound is right, the Thiels following the CS2 and 3.5, while certainly not sounding shelved down in the highs, are not as forward-sounding and as tilted to the highs as the earlier models. Matching them with a forward-sounding amp might be a little too hard on the ears, at least at higher volumes.