Purchased "Aqua-Computer VRM cooler" from Scan computers, it didn't specifically say it'd work with my Abit x38 QuadGT, but I tried it anyway, and it does!
@3.2Ghz, load temps for the VRM/PWM's was 60c, that's with a 120mm fan blowing on the old heatsink, without it would go way over 100 and eventually shut the system down around 120.
WITH the watercooler the load temps are 50c, and never go above that. Very happy with that :)