I just don't get why you are so set on barebone kits....you just don't get the value/quality that you get when you choose your own parts. For instance, that hard drive only has a 16MB cache and the RAM is only DDR2-800. Not to mention that you can get so much more for your money. I threw together something for you and others here can let you know how it looks. It's in your price range.
To everyone but the OP: Please help me out here. I'm NOT an AMD guy but with his budget it seems like it might be the best value. I'll also throw together and Intel build, though, and we'll see what price point we are at.
MB: ECS 780G
CPU: AMD Phenom 9600
RAM: OCZ 1066
(Someone may recommend the G.Skill at the same price point, but I've heard OCZ OC's better....)
GPU: HIS ATI 4870
(Does this out perform the previous posted 9800 GTX+ ?...I could've sworn it does..and it's not much more.)
HDD: Seagate 750GB w/ 32mb cache
DVD: LG 22x
Case: Raidmax Smilodon w/ 500w PSU
(I personally have this case, and w/ PSU it's a great value...you'd never need that 750w listed in the barebones kit...at least not now)
If you add all that up with rebates it comes to $529. That's one hell of a computer, and way better than the one you listed, for $529! You'd be back to around the price of that barebones if you stuck with the nVidia card listed vs. the ATI one I prefer (depending on what others say...).
And for the intel build:
MB: Gigabyte P45
CPU: C2Q Q8200
Everything else the same=$625
But I'm thinking the AMD will have similar performance and better bang for your buck.
Intel Core i7-2600K @ 3.4GHz || GIGABYTE GA-Z68X-UD3P-B3 || Corsair Vengeance 16GB DDR3-1600 || EVGA GeForce GTX 480 || Samsung EVO 256GB SSD
my feet get cold and that gives me diarrhea sometimes - Smart_Guy