I think John Potis nailed it in his Soundstage review when he said to buy the finest SS amp you can. Jeff Rowland amps are a great match to the 6.5s. Cabling is also very important. Neutral and quick works best.
I have run all kinds of different amps with my Soliloquy 5.3s, and I have liked everything I've heard--from 5 watts of triode tube amp to a 150 watt SS monster. Yes, I've changed amps a lot, but not my speakers. The Sols' are keepers!