http://uk.pcpartpicker.com/p/HmTw8d
Updated the list, but it's a little over your budget, so if that isn't do-able, tell me what kind of games you plan on playing and I'll try to clear up any thought you might have on what you'll need and how much it will be
This current build will play games like Skyrim w/ ENB mods at 70 fps on high graphics as well as games like Assassin's Creed: Black Flag on 60 fps