ramsinks are useless unless you want your memory to look pretty ^_~)
it would be pretty tough to outdo the thermalright
xp-120 in terms of outright performance:
i was an early adopter, and thus didn't have much choice in the matter. however, the zalman
cnps7700-cu is very quiet for the cooling it provides, just don't expect to oc (i have the older cnps7000a-cu).