Cyberpower and iBuypower both have high rates of return due to system issues.
Windows 8 is not a good OS for gaming. You want either 7 or XP.
This article was just released on Kotaku today and I feel you should read it since you're a noob.
The computer you linked is terrible because it is $789 and needs a new PSU ($50) and a new graphics card ($300) for a grand total of $1,139. You can build a better system for $700
I'm officially convinced to build it. I guess now I'm just in need of pointers on parts. I understand ram, processors, graphics cards and stuff, but as far as motherboards, cases, fans, PSUs, I'm quite clueless.
You've helped me a lot so far and I appreciate it.