oh..according to your RIG as stated below. its 4.45ghz. what are you currenly using now?
well, since u asked for a recomandation. i would recomand Asus silent knight 2 as im using now. if your not a fan of asus silent knight, get Thermalright ultra 120..
for the GPU, im using thermaltakes Du0rb.
for the thermalpaste, it dosent matter wather its for CPU or GPU, cause its just a compound or liquid that transfer the heat from one point to another. get a good thermal paste like Artic coolnig mx-2 which im using now for both cpu and gpu with no problems AT ALL.