I just got the Zalman CNPS9500LED. That thing is huge but works really good. I had stock fan before and had temps idle/load at 32/58 and with the Zalman it's now 23/32. Big change on the load temps, blue LED and the fan is very quiete. Maybe look at that one, with AS5 of course.
[size=1]Antec Case w/Antec TruePower 2.0 430w
DFI LanParty Pro875 rev. A
P4 3.0@ 3.31 w/Zalman CNPS9500LED w/AS5
Corsair XMS3200 1gb (2x512) @ 245 2.5,3,3,6
WD 150GB SATA
SoundBlaster Auidgy 4 w/ Logitech x530
EVGA Geforce 7600GS 438/435