I had the opportunity to visit Thiel about 5 weeks ago. In their listening room they were using the 7.2s with Krell monoblocs with Alpha Core Goertz AG3 speaker cables. I've been told that Jim Thiel voices all of his speakers using the Alpha Core cables. Thiel's website lists some amplifier companies that they use (and it seemed that they have at least one sample from each of theese companies in their listening room). As far as cabling goes, they recommend Alpha Core, Audio Quest, Cardas, KimberKable, Nordost, Straight Wire, Synergistic Research, Transparent, and Wire World.
I personally have tried the lower line Alpha Core cables with my 2.3s and was not pleased. I have heard good results with Kimber and Synergistic on many Thiel models, though the 7.2s sound fantastic with the AG3 in Thiel's listening room. The rest of their system consisted of a BAT preamp and a Musical Fidelity SACD player (with Alpha Core interconnects).