DVD - Good
Case - Save 24.99 and get the Centurion 5 or the Centurion 534
HD - Good
GPU - See Below
PSU - Don't get rosewill psu. Go with Antec or another reliable brand. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$30 for this PSU and if you read the reviews people run quads and 4850's and such on it with no problems. I can't recommend any other PSU for the price range.
RAM - Good
Mobo - Good stuff, just got one of these for my GF. It OC's real nice.
With my recommended changes here's your rough price point:
DVD - $25
HDD - $65
PSU - $30
RAM - $40
Leaving you 260 for shipping and video card.
If you can do rebates, you can get the 4850
for around $150, leaving $90 for shipping.
Depending on shipping you could afford that 640gb hard drive.
So that's 2.5 of your wishes.
1. GPU (Most important)
2. Hard drive
3. Antec PSU (not corsair, but f-ing awesome PSU)
Hope this helps, anymore questions feel free to ask
This set-up will give you a few options for the future. You can add on a cpu-heatsink if you want to overclock in the future, and dropping in more ram is always easy. Around a year from now, something like the q9450 will pretty cheap and upgrading to a quad core will be easy and more justifiable.