Looking great, only two things, one you already pointed out.
That PSU could do with a increase in power, so bump up the voltage to the 400-500 watts range if you can. Avoid generic models with no brand. However, don't break the bank on this issue.
Change the motherboard! After a quick Google search reviews don't look too good. For example the PCI-e slot only runs at x4 instead of x16, which would make the purchase of the 7900 almost a waste. BREAK THE BANK DAMMIT!! lolz
Also I assume that you have a CD/DVD drive not shown on the list. Would be silly of you miss that out.
Once you get those two sorted out you will have a pretty good spec.
Edit:
I'm curious, what is price for all that?