All looks great except the mobo, I'd go for a GA-P35-DS3R (Asus mobos are severly overpriced and overrated), and since gigabyte is making the best mobos lately, there's simply no discussion. go also with 2x1GB Crucial Ballistix DDR2 800.
As far as displays are concerned, probably a Samsung 226BW 22" is the best display that doesn't break the bank.
get the 8800 GTS 640MB, the HD2900 draws more power and isn't really any better. The psu will fit since all ATX power supplies are a standard size. You don't really need all that power though if your not going to do SLI or Crossfire.
The HD2900 can't do AA, the GTS can, if you're okay with a $400 card that simply cannot do AA then go with it. I've read way too many times how that problem is hardware based and not software based, so it cannot be fixed through drivers. I forgot to comment on that.
mb- ASUS P5K Deluxe or Gigabyte P35C DS3R
gpu- 8800 gts 640mb
psu-PC Power & Cooling Silencer 750 Quad
case- antec p182
i want to know how gigabyte is better than asus besides price
The asus with a 8800 card i heard blocks the first 2 sata ports? would this be a problem if i just use the other ports instead since im not using more than 3 sata.
The gigabyte i dont really need the serial or parallel ports and read that while using vista if u dont have the license for songs that it'll only play a sample of it. so any confirmation or its just wrong?
There's also this case modding guide for the 900 that shows pretty well how to hide all wires if you are looking for serious WM. Also some pretty wicked mods that people did with the 900 on that thread...
ASUS just hasn't been working out for me for the past year, they keep putting overpriced motherboards (Striker Extreme and P5K come to mind) with a lot of annoying quirks that shouldn't happen (PSU & Ram compatibility problems just to name something), however Gigabyte has been proving themselves a lot lately, putting out quality products at very affordable prices that make them the default solution for everyone.
Go with the HD2900XT, ATI has since fixed the AA issues with catalyst 7.7, I have the card myself and play everything at fairly high AA. Also my card hasn't gone over 62*C (havn't overclocked as of yet).
Go with the 900 case, I have it as well, it's a tight fit but every PSU will make it in there, PSU come longer not higher.
I agree with other people here, stick with gigabyte I have thier boards and have had only one problem regarding memory issues, but has since been resolved.