Soliloquy demos their speakers at shows with Art Audio amps and raves about them--I can't think of a better endorsement than that. One of the guys who works for Soliloquy uses the Jota with the 6.2s at home. That said, this is always a personal decision and I certainly wouldn't argue with Atma Sphere. I've got the 5.3s and if I were going the tube route those would be the top two on my list. Don't have any experience with the SF amps and Soliloquy. Best of luck.
Tim
Tim