Budget Gaming Build for a Friend

My friend has an older laptop that he's currently using for gaming, and now wants to build a desktop. He is willing to spend up to $1000 for the build, but that budget must include a monitor as well.

Approximate Purchase Date: In two weeks
Budget Range: $800 - $1000
System Usage from Most to Least Important: Gaming, Live videocasting,
Parts Not Required: Keyboard, Mouse, Windows 7, Speakers
Preferred Website(s) for Parts: newegg, and amazon
Country of Origin: US
Parts Preferences: probably AMD CPU
Overclocking: Maybe
SLI or Crossfire: Maybe
Monitor Resolution: NEEDS A MONITOR (1920 x 1080)
Additional Comments: Wants to be able to play newer games on high settings and future proof

I like the Radeon HD 6850 for gaming budget builds, but it seems to have gone up in price since the last time I checked.