About to buy an Opteron 146+Asrock 939Dual

[m3ta1head]

Hey guys, what's shakin'

I've been browsing here for a while, and I know the dude named SDX on here. He reccomended this site to me and you guys obviously know your stuff

Anyway, I'm about to order the following:

edit: removed the link (changed my mind), but it's an Opteron 146 s939

And the following from the Egg:

Zalman 7000b cu led
ASROCK 939dual SATA2

Along with some fans and stuff. I wanted to get one of the DFI LANPARTY boards from Newegg, but there are a couple of problems:

I currently own an AGP BFG 6800nu (unlocked 16,6 375/840) which I can't seem to get rid of. Also, I have a 20pin generic 450w power supply, which I obviously can't use with the DFI.

How will my overclocking experience be with the Asrock? I've heard very good things about it w/ the OCworkbench beta bios. Anything else in general? I'm very short on cash atm so I can't afford much anything over $300.