Midrange Gaming System Build

I am choosing parts for a friend's gaming computer, I just want to make sure there aren't any red flags with this build.

179.99 XFX GX260XADJF GeForce GTX 260 Core Edition Core 216 896MB 448-bit GDDR3 PCI Express 2.0 x16
46.99 G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model
159.99 Intel Core 2 Quad Q8200 2.33GHz LGA 775 95W Quad-Core Processor Model BX80580Q8200
31.98 ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler
134.99 GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard
59.99 Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s 3.5
64.99 Antec BP550 Plus 550W Continuous Power ATX12V V2.2
44.99 PLEXTOR 22X DVD Burner Black SATA Model PX-850SA PLEXTOR 22X DVD Burner Black SATA Model PX-850SA

Total = 723.91
I'm ordering all the parts off newegg and waiting for my friend to pick a case he likes. I went with the cheapest quad core I could find and added a decent cooler since it will probably be overclocked. The OS will probably be Vista x64 however my friend will handle that on his own. The budget is about $800 but obviously lower is better. So I guess my questions are, should I change anything for a cheaper part? Is there something blatantly wrong / even mildly wrong with the hardware I've chosen? and are there any other recommendations you would like to add?

EDIT: I should have added, he's not into gaming at the "runs crysis at 60fps constant" level. Source based games, newer games playable at medium settings (FPS and RTS mostly)

Looks good to me keep the QuadCore and OC it i don't recommend getting a dual core since your friends is going to play RTS games,and he will benefit from extra cores

well if he really wants a cheap quad core, you could get him an Phenom II X2 550 and unlock the other two cores...lol...

But if you really want to stick with intel, I would definitely OC that quad core

If you want a really good power supply:

500W to 550W: 12 Power Supplies Compared - Anandtech.com

http://www.anandtech.com/casecooli [...] =3516&p=35