As Ki said, budget CPUs are generally the ones that clock like a bitch. Pay reasonable money for a mobo and just get RAM based on speeds for OCing (E.g it's unlikely you'll hit 4Ghz on a non EE chip with 1333Mhz RAM as the RAM will be running way to far OCed (Talking about intel here though)).

In terms of PSU, I normally go for expensive ones, but providing you're not going stupid with OCing and using high wattage hardware,a cheaper one would be fine, I would personally stick to CIT if you're going real budget end, but stretch to OCZ if possible.

GCard board partners; yes XFX give you this warranty that allows OCing etc etc, but from what gets posted on forums, it's a complete PITA to get them to RMA a card as they reject it for very simple reasons, and tbh using software tools it's impossible to tell if a cards been OCed, it's things like flashing the BIOS of the card they can tell.

Mitch's spec looks good, maybe add like 1 or 2 fans for the case if it doesn't have any, other than that, looks nice and solid.