Asus 8800GT Urgent Help!!

Hey guys, i have the Asus 8800GT 512MB (new version with the big round heatink+fan) and tomorrow, i want to install my new " Arctic Cooling Accelero S1 Rev 2 with my Antec Vcool blowing air onto the accelero s1 rev2... i've heard that i should use the compound stuff which is suplies with my "accelero s1 rev2 heatsink" but i dont know what compound/paste to use.. i have arctic silver 5 at home but so many people told me not to use that on a GPU, as it will leak and burn my GPU.. any ideas on what i can use? safely + with the best performance?

Thanks