Unless you intend to buy a super high resolution monitor (above 1080p) or play games on a multiple monitor setup, you can build a system that will meet your needs for much less.

If you are based in the US, you don't need to spend $2,000 to build a desktop that will run every game at 1080p. You can always upgrade your graphics card in the future if games suddenly become more demanding a few years down the road.