any good prebuilt gaming pc's?

Ive toyed with the idea of building one myself but with my limited knowledge and the gamble id be taking with expensive parts i decided against it. (Plz dont try to suggest i build one myself as im not going to do that).

Ive been looking at this pre built pc (has good specs i think but ill be upgrading the graphics card most certainly as the 620 it comes with sucks)

http://www.newegg.com/Product/Product.aspx?Item=N8...

I will only be using it for gaming, surfing the web, and writing a few short stories. But it will be primarily a gaming rig and im wondering if anyone can either let me know about the reliability of this particular pc or suggest other good prebuilt pc's that use either 8 core amd processors or i3/i5 processors for 800 or less.

I care more about the processor than the gpu because id rather upgrade my gpu than my cpu