These are the Mobo's that can be OC'ed(I believe the one your looking at fits the bill)
http://hardforum.com/showthread.php?t=1677395 the directions are very specific and must be followed to a tee, well worth the effort. I never was successful with an 11.10 build.
I recommend a used PSU from Oklahoma Wolf/Johnny Guru in the classies. Something like this with 2 EPS 8 Pins...
http://www.overclockers.com/forums/showthread.php?t=711867
Your PPD at stock clocks should equal mine, I'm running the 6128's as well.
If its a budget build skip the case and put it on a bench it will be so much cooler. Then you can forgo the WC and run CM 212+'s. Here is the sticky thread on recent builds and all 4P info.
http://www.overclockers.com/forums/showthread.php?t=697924 Mine is the budget...If you wanna go cheap
I have no regrets, My PPD is greater then I could have ever gotten from my 4 or 5 other rigs combined. Uses less electricity as well. (550W or so) It was also my favorite build. Its a conversation piece. My only regret is not OC'ing it.