bill10907
Nice "old" system. The good news is that Thiel speakers does respond well to Tubed gear (CJ, P.S. Audio, VAC and VTL) just to name a few. I am a big fan of the CJ CAV 45 control amp. I would like to see the S3 version with more current and power output. Great opportunity there. Let's see how CJ approaches the next version. Classe' is certainly a sonic match.
Now, to address your Wattage query. Anywhere from 50 to 300 watts will be sufficient. Much will depend on your room and volume preference. Keep me posted as you demo the Amps.
Happy Listening!