$1500? criminy, I spent ~750 on building my gaming computer and it plays everything at 1080p with some AA and AF.
Don't really see a need to go over 1000, trying to 'future proof' a gaming computer is kinda pointless IMO, since really all you get is a little bit of extra life at some higher settings, but you can just put the money you saved not buying higher end components in the first place into good upgrades.