Although Antec does make good PSUs, they have been slipping in the quality department. I would never use a PSU, included with a case. The one I suggested is very reliable, and one of the better cheap budget PSUs out there.
From the Techies' Bible:
"Thou shall not skimp on thy power supply."......You risk losing your whole system, if you do.
I wouldn't say the 7600GT does good on Oblivion at 1024 x 768. More like struggle. I'm thinking in the 10-20fps range.
GeIL works for Intel too. Don't take those newegg reviews seriously. There are alot of idiots rating stuff on newegg.
The X2 3800+ has a bit more L2 cache to it, that's all. Both the X2 3600+ and 3800+, have the same overclocking potential. If you're not overclocking, I would of suggested the X2 4200+ instead, but seeing your on a tight budget, the X2 3800+ will do fine....but you really should overclock. Anyway, your choice.