240hz G-Sync gaming monitor. If you're getting into competitive e-sports, you've most likely already heard about this BenQ Zowie monitor. It's down from $799 to $499 at PLE
From PLE:
The XL2740 esports gaming monitor offers the smoothest gaming expeirnece in a large screen size of 27inch. Best suited for games that have a very high FPS cap, the XL2740 comes with most of the essential features you will need to be competitive in your game.