Amp recommendation to drive Thiel 3.6 speakers

I have been considering a used pair of PS Audio BHK Signature 300 Monos, claiming ratings of 8Ω/300W, 4Ω/600W, 2Ω/1000W. Another consideration is a pass Labs X350.8. Not sure if I should stay with tubes or go with SS in power amps.  Some of the original amps that the speakers was tested early on (like the CJ MF2500) are now vintage and I would rather stay away from something that old. I have read reviews of the Brystons saying that they work but they may be better choices to bring out the full detail and low end of the speakers. Some reviews warn about a harsh tweeter with certain power amps. Not sure.
Comments?

Cheers
Achilles

$10K max.

I looked at a Gryphon Antileon Signature. I wish! Unless the photos have me wrong, what an ugly monster, the wife will run me out.
Going back to the PS Audio BHK Signature 300 Monos, anyone has any experience with them?

Update:
First off, thanks for all the suggestions, thoughts, discussion. It was helpful.
I ended up buying a used pair (recent build, 2 years ago) of Parasound Halo  JC1's, which are on the way. I hope I made the right decision. According to specs, they have enough power to drive anything down to 2 Ohms, but keeping fingers crossed that they will sound good.
In addition I upgraded my pre to an ARC Ref 5SE. So hoping that the Thiels will finally sing.

Now, I have for sale the Manley 250 monoblocks (I checked tube bias yesterday and they are all on), the ARC Ref 2MkII pre, the ARC PH3 Phono, and a Transparent Ultra RCA 1m interconnect cable.

The JC1's are in transit, and it remains to be seen if sonically, they fit well into my system. An Audiogon guy who had pre-owned JC1's and was now selling a Luxman M-900U commented that the JC1's and "cold and clinical".

On a related issue, I have owned the CS3.6's for so long that I lost touch with other speaker developments.
What are some of the best speakers that can be had today (used) for under 10K?