NEED HELP NEW BILD FOR GAMING BF3,ect.

Hazle

Distinguished
http://pcpartpicker.com/p/Gglw

i don't know what keyboard to recommend, but you got a bit left to choose your own. personally, a little far too invested on that case but i guess it's within your budget.

EDIT: if you got no plans to run a dual SLI/CF setup , you can tone down the PSU to something like Corsair's CX600 or any quality brand 600W psu around that price.