I would look at Pass amps, most notably the X-350, there is a new in the box on Audiogon for $7,500...retails for $9,000. A writer for TAS, Anthony Cordesman uses 7.2s with the Pass X-600 as his reference. Pass Labs gives you tube sound with solid state reliability.
Amp (<10k$) for Thiel CS7.2s
I am currently driving my Thiel CS7.2s using Bryston 7B ST monoblocks (in parallel mode). The 7Bs provide the kind of current and power that the CS7.2s thrive on and overall sound quite good. However, after auditioning some of the top SS amps over the last few months I know that the Thiels can offer even better sound and performance. Specifically in the areas of soundstage, tonal color, richness, detail, delicacy, and dynamics. To date I have auditioned at home (and would rank in order of preference) the ML336, McIntosh MC602, Classe CAM350 monos, and the Krell FPB300. I want to stick with solid state for practicality and the fact that the Thiels are also the L/R channels in a HT setup. Any comments on experience with the above amps or others that I may not have considered, especially used w/Thiels, would be appreciated.