My personal favourite at the moment is a Taisol heatsink (the one with the copper insert) and a Thermaltake 33cfm 60mm fan, good performance, cheap and no louder than a 26cfm YSTech - I got that combination here in the UK for £23, which translates to around $35, but I'm sure you could find one for a lot less in the States (assuming that's where you are).
cheers
tweakr