Case/PSU comob - $100 shipped!! You get a nice case and a 500w (34A on the combined rails) for a very good price! The PSU has 2 x 6 pin PCI-e power connectors for future GPU upgrades, if you want/need them. The 4770 only needs 1 x 6 PCI-e power connector, so that leaves 1 more for crossfire or if you upgrade to a bigger (more power hungry) GPU!!
Antec Sonata III 500 Black 0.8mm cold rolled steel ATX Mid Tower Computer Case 500W Power Supply - Retail
HD - $55 shipped!! One of the faster HD's out there in the 500gb size. You can spend more and get bigger, but this would be a good OS drive to have. Than just add a data drive (1 TB or larger if you like) if you want more.
SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive http://www.newegg.com/Product/Product.aspx?Item=N82E168...
OS - $105 shipped! Get the 64 bit version so you can upgrade your RAM past 4 gb's and get full use of the extra RAM!! Now if your a student with an ".edu" email address you can get Windows 7 for $30, so that would be a $75 savings!!
Microsoft Windows 7 Home Premium 64-bit 1-Pack for System Builders - OEM http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Now you can get an Athlon II x4 620 or PhII x2 550 BE for ~$65 less than the PhII x4 955 BE. This $ could be spent on a better GPU than the one listed above. I'd recommend this GPU if you decide to go with the 620 or 550 BE over the 955:
The 620 or 550 BE matched with the 5770 GPU is a better gaming setup for ~$25 less. If you wanted a bit more CPU power than the 955 is the way to go. The Athlon II x4 620 or PhII x2 550 BE is less of a CPU, but mated with the 5770 GPU, you should have better FPS than the 955 w/the 4770. You can decide which way you want to go.
It's up to you, but the build I put together will game better than the pre-built one. If your not comfortable with building your own, than a pre-built will work. You just lose out in the knowledge of building your own and also lose out in troubleshooting issues later. I still would be a bit leary about the "600w" PSU that is listed, by that is just me. If I knew what brand of PSU it was, I would feel a bit better.
do not even take a look at the cyberpowerpc one. I have been researching them for a while. They use generic parts and do not have good quality and do not put parts together well. On that note ibuypower and i forget the name there is another one by the same company. Unless you are willing to gamble do not you cyberpower or ibuy power. By the way if you want to use cyberpowerpc after all i have been looking at them for a while so i can show you the best and cheapest build