We already have a number of TIM's tested, and we will continue to test more...
TIM Round Up #2
However, for now go ahead and use what you have on hand it won't make or break your system. The best advice I can give is to use the proper amount (I prefer 2 grains of rice sized blob in the center) and make sure you get a good mount from your cooler onto your chip.
I always use "I Can't Believe it's Not Butter"
