Best 1200$ Gaming Pc build? help

Communities Gaming
1

Im looking to build a pc for the first time, need help on picking parts.

2

How about this?

http://teksyndicate.com/videos/build-best-1300-pc-dec-2012

3

Are you gonna be overclocking? Do you need an OS, mouse, and/or keyboard? For now, I'll give you these options:

http://pcpartpicker.com/p/E3nN

http://pcpartpicker.com/p/E3qv

http://pcpartpicker.com/p/E3rA

http://pcpartpicker.com/p/E3pY

http://pcpartpicker.com/p/E3s3