Int Amp for Thiel CS 3.7

The T+A, Vitus, and Gryphon amps (not familiar with Luxman) are obviously all fantastic and will drive your speakers without breaking a sweat.  At this level it comes down purely to personal taste and system synergy.  If you can't hear all of them in person, read all the reviews you can and look for the one that matches best with the sound characteristics you are personally looking for and that are most important to you and choose that one.  Frankly, I'd be shocked if you weren't absolutely thrilled by any of these, so fortunately for you going wrong has likely been removed as an option.  Best of luck and let us know how it goes. 

There are a couple Vitus RI100s available here now that I'd think would sound phenomenal with your Thiels.  Best of luck.