Amp upgrade for Thiel CS 3.7

One other thing, at the end of the month i will have the opportunity to listen to the new Mark Levinson line up : the n° 526 preamp, the n° 536 monoblocks and the n° 519 audio player.
I'll let you know what i think.

Krell has always made well respected products, yet...
Please do not be offended: I find the Krell to be somewhat lacking in imaging, AND, to me, sounds a bit grainy in the upper midrange. I would not choose it, but that's me. You do need a stable amp that keeps doubling, as pointed out by georgelofi.
The THIEL's are ruthless in revealing products upstream. I'd prefer a Classe Amp, or a used Gryphon, (though probably out of the question financially.)
Good Listening.
Larry

Ironically, Thielist, I have not yet heard my CS6's. They were damaged in shipment due to inept packing by Craters and Freighters of Cleveland,which I do not recommend. I have repaired the dent, sort of, but now await the arrival of the Krell 250 monos. I will let you know how these match up. However, my experience with Krell has been excellent; the fpb 300 dominated my thiel 2.4's--by that I mean the speakers opened up dramatically, without the analytic "bright" sound attributed to the Thiels by listeners who had their speakers underpowered or paired with inferior electronics. Krell eptiomizes high current amplification, and has an outstanding service department. I have high Regard for Classe as well; my humongous CAT 660 was humiliated by a pair of 300 wpc Classe monos in an A-B test conducted by my friend and Classe/B&W dealer in Lubbock. 
I have heard the grainy/imaging complaint as voiced by Larry; however, I have not observed that with the 2.4's. I don't claim to have golden ears, not at my age, but I will share my experience with the CS6's.
Cheers, as they say up north!

I'd also look for a high powered Ayre amp

Good to see you- thieliste

the Krell would be ideal- do not worry about overkill.

I own the CS 2.4SE loudspeakers from Thiel. I, too, am shopping around to complete my reference system.