Thiel cs2.3

What's your budget.
And is it fair to assume you are open to buying used.

Yes I would be interested in buying used the Thiel car 2.3 Are rated at 400 W handling power so I do feel like I need at least 350 maybe even 400

Had CS 3.6 for many years and of all the amps used the best match that I came up with were the Krell KSA and MDA series amps,  A Krell KSA-250 was a staple for quite a long time with the Thiel CS 3.6
Detail and absolute control of the 3.6 was high on the list and the KSA-250 did not disappoint.  They dipped down into the 2 ohm range but that never phased the older Krells.  Even a KSA-150 works well if your room is not too large or you don't push to a ridiculous dB level.  My old room was rather large so the KSA-250 and MDA-300's had more reserves for large dynamic swings. 
Power output from the 150 and 250 was - 
150 w > 8 ohm   
300 w > 4 ohm
600 w > 2 ohm    

250 w > 8 ohm
500 w > 4 ohm
1000 w > 2 ohm 

Thanks for all the help. I appreciate everything. 

If your looking for a great amp for the Thiel CS2.3's check out a McIntosh amp like the MC352 or MC452, these amps are stable down to 2ohms and don't run HOT, like some pure class A designs. Either of these two amps are of super high quality and are built like battleships and sound even better, probably the last amp you'll ever want or need.

Matt M