CPU
- Intel C2D E8500 (3.16GHz/6MB/1333FSB) ~$325 (C WORLD)
OR
- Intel Core i7 920 ~$450 (CPL)
G/V card
- XFX 896MB GTX 260+ ~$305 (CPL)
OR
- Gigabyte 896MB GTX275 ~$355 (CPL)
RAM
- Kingston 6GB DDR3 ~$145 (CPL)
OR
- Corsair 6GB DDR3 ~ $165 (CPL)
Monitor
- 19" Acer X193HQ (1440*900) ~ $150 (CPL)
OR
- 20" LG W2043T-PF (1600*900) ~$189 (CPL)
HD
- Seagate 1TB SATA II ~$135 (CPL)
OR
- WD 1TB SATA II ~$138 (CPL)
These are the parts I have an idea about, I'm not too sure about Motherboard, Power Supply, Case & Cooler. I wouldn't recommend Blu-ray drive as 1) The average gamer wont need to use it often. 2) Pioneer Blu-ray drive costs ~$299.
With the cheaper alternatives: $1063, which leaves $437 for remaining parts. Assuming you already have keyboard, mouse, speakers, OS etc $437 might just cover the rest, although unlikely.
NB: OS will have to be 64bit in order to support 4GB+ RAM, if not, consider 4GB DDR 3
Actually, Blu-ray is $163 for a combo (non-burner) drive. It's not too bad if you're contemplating a HTPC/psuedo-HTPC setup.
Monitor - consider a 22" monitor. There's a model of LG that's cheap and very good, can't remember what the number was. The Samsungs aren't too bad if you have the money. Or, even better, get a Dell Ultrasharp.
Mobo - ASUS P5Q3 (
only for the C2D)
Are you trying to build a silent system or a ZOMFG OVERCLOCK system? These will affect what PSU/Case you should get. In either case, I would suggest the Corsair VX420 as this should be ample power, quiet and quite cheap for what you get.
Case - think about what you like. After all, you're gonna have to be looking at it day in and day out. Have a browser of this place
http://www.pccasegear.com/index.php?main_page=index&cPath=25 and see if you find anything that tickles your fancy. Let us know so we can give feedback (in conjunction with your desires for the system).
Cooler - do you intend to overclock? Stock cooling is fine if you don't plan on overclocking. However, the king (maybe he's been overthrown?) of Socket 775 (C2D/Q) cooling has been the Thermaltake Ultra 120. It's around $70-80 bucks and you'll also need to get a 120mm case fan to attach to it (~$20). A bit steep, but the cooling can't be beat.