What is a good speaker to match with Classe ca-100

I agree that Thiel speakers sound good with Classe amps in general. I had a CA-100 driving my Thiel 1.5's and they sounded very good. The CA-200 was even better with tighter and more defined bass. The CA-100 wasn't bad at all though. I think its one of the best amp values around.

I've had excellent results with Thiel (anything up through the 2 series, I had 2.2's). Also had great results with Magnepan MG IIb (with the CA-100 I would not go higher than the 1.6). Bass is not a strong point with this amp below 30hz. Otherwise it's a nice amp, I actually had 2 at one time. Right now I drive Thiel CS 5i's and Magnepan 3.6's with a CA-400. Good luck

I like NHT 2.5's with your amp. Other combinations work well too, i.e. CA-200 with NHT 2.9's, or CA-300 with NHT 3.3's, the two brands sonic signatures work well together. The NHT's are great but with some recordings are just a touch bright, but this is a synergystic relationship with the Classe's which have a ever so slight darkness to the top end. Both brands are close to nuetral, but their slight biases complement each other.
Good luck.