Bryston, McIntosh, Krell or Mark Levinson

I have the same speakers, and on my list of amps to consider are Ayre, Parasound A21 or 21+, and Benchmark (if I recall Tom Thiel uses these as a reference for his Thiel hot rodding projects).  Currently I run a Krell 350il coupled with a tube preamp and it sounds pretty darn good for the price, more musically immersive is a BAT VK55 so do consider tubes as well!  BTW I hate it when posters add to the list of options rather than help narrow it down, so my apologies for doing this to you!

And am now adding the LSA Voyager to the list.

@thosb The Benchmark AHB2 is what Tom Thiel uses with his Thiel, not sure which model. I used the AHB2 in stereo and mono with the Thiel CS3.7. The AHB2 is my all-time fav amp. I still have them. However, on my CS3.7 and the 2 Ohm dips the AHB2 was not ideal to bring out the very best in the CS3.7. The AHB2 are also not going to hide any brightness if it exists anywhere in the system The CS3.7 ae not bright.

Your speakers many not play in the 2 Ohm region so they could be OK. However, there are certain speakers I would not use with the AHB2 even if the power specs matched. Such as a Paradigm Persona, TAD ME-1, or bright sounding speakers.

After now close to 60 hours of break in on the Voyager I have decided to use it on my Thiel CS3.7 and use the excellent CODA #8 on my RAAL SR1a headphones. Both would be great on your Thiel.

if you want an amp that u can upgrade speakers to, and never worry about impedance, or anything else, get the Sanders Sound Magtech amp.

  the last amp you will ever need!!

Thanks for your suggestions; keep them coming.  I must admit though, that I'm a bit surprised at some of them.  Before buying my speakers, I did a lot of readings about them, mostly here.  And I read a lot of amplifier reviews on Stereophile (which somehow fueled my bias toward the behemoth amps).  One thing that would come up about the thiels was how hard they are to drive and that their impedance would drop down to, and remain at, 2 ohms.  So, I thought that nothing but Class A or Class AB amps would do. As you can see from my original post, I've only been considering high power behemoths.  So I'm surprised that some of you are using Class D amps to power yours.  As suggested, I have been researching the LSA Voyager 350 GAN amps. More surprising is that the LSA Voyager is said to be nicer than the Bryston 7B SST.

@yyzsantabarbara, it would be much appreciated if you could elaborate on why and how you find them to be nicer, because I'm seriously considering a pair of used 7B SST2's.