You can get the Zalman's at
this link. I've done business there for quite a while, never a problem. Good spot for various bits and pieces like the Zalman and fans.
As far as rads, I would put the vote for using a heater core.
Regarding drives, the fluid bearing Maxtors aren't that bad. Check out the review at
Storage Review. But as Brad said, the Cudas definitely define quiet (have Cuda IVs myself).