i really like the ceramique by the same people that make AS5...the thing about ceramique is that it's not conductive and it cleans up easy with about 2-5deg difference....if you are worried about heat just get yourself a water cooling kit...it's so much better than air cooling
EXACTLY what I wanted to say. I just put water blocks on both my GPUs and when it came to compound choice, I went straight for AS Ceramique. It's very safe, easy to apply and performs great. Not as well as the top compounds, but still leaps and bounds ahead of stock thermal paste on most components.