Thermaltake XP-90 for $40 here and with code: right-on , it drops to $26.25. $7.62 shipping to CA. This is a very light hi performance cooler that fits most all mobos 939/P4/etc. Great for lan rigs cuz of it's weight.
Good silent cooling. Zalman 7700. You may have adjust some of the fans depending on your mobo. I'm assuming it's free ground, but didn't check.