Roman, AnandTech's recent Mid-High Buyers Guide suggested the SLK3800B (pretty sure, its the SLK3000B+PSU), any reason you don't like the included PSU? It costs the equivalent of $48 or so for a 400W SmartPower 2.0 ATX 12V 2.0 PSU.
Opteron Guy, I've never built a computer (or OC'ed), do you...