Decent Gaming Build

Approximate Purchase Date: this week or next

Budget Range: $600-700

System Usage from Most to Least Important: Gaming, Surfing Internet

Parts Not Required: keyboard, mouse, monitor, speakers

Preferred Website(s) for Parts: newegg, microcenter

Country: USA

Parts Preferences: No preference

Overclocking:No

SLI or Crossfire:No

Monitor Resolution: 1920x1080

I've been looking around the forums and looked through a lot of threads but I can't get a general idea of what to buy. I'm helping a family member out and just need some advice on what parts to get. It just needs to be able to run Battlefield 3, doesn't have to be able to run on Ultra or High, just a good build for him to play on. Any help would be appreciated!