If you play games other than FPS titles look into an IPS monitor. Much better colors than TN panels like the benq posted. Slightly slower response times, but I haven't noticed a difference. Recently picked up this Asus MG279Q and can hardly notice a difference in response times between it and my older VG248QE, but the colors are a huge improvement.
That being said, if you only play FPS games a 240Hz TN panel is probably the way to go at your price point.