Go for the Koolance Exos or PC2C. Relatively cheap, relatively easy, good customer support, keeps things nice and chilly with no real advance knowledge needed. A very excellent entry point, speaking as somebody who used to run one.
My 3200+, stock HSF, running Seti@Home all day every day, keeps steady at around 120F, and everything seems to be perfectly stable...
Wishing the 70C load temps on my video card were lower and that Artic Cooling had the Rev4 of the VGA Silencer out NOW instead of in two months,
Piloter
Specs:
http://snipurl.com/7w00 |160 Gb SATA Barracuda|Home Theater surround sound|Playing X-Com and Commander Keen =)