Sorry if this has already been addressed. I'm at work and in a hurry and didn't see anything on this during a quick review of threads.
Anyway, I got my P6T and was delighted to find that it has mounting holes for both 1336 and 775 heatsinks. I was able to re-use the S775 hardware for my Swiftech Apogee waterblock and mount my watercooler to my 920
Just thought I'd pass this along for those considering the switch, it might make the pathway easier for you