Only slightly less impressive than the flagship 30" model and significantly cheaper, though not as cheap as Ken's favourite Korean monitors, the deal for today is the 27" Dell UltraSharp U2711.  You still get the high resolution and variety of inputs including HDMI 1.3, DisplayPort, two DVI, Component and Composite along with USB connectivity.  As it is an IPS display it will function well as a professional display and the response is fast enough to serve a gamer as well.

Dell UltraSharp U2711 27" 2560 x 1440 LCD Monitor
Dell Home is offering 27-inch UltraSharp U2711 LCD Monitor for $629.99 plus FREE shipping. Use $299.01 instant savings and extra 10% coupon code: ?K0N8$SDH1ZF0P to get final price.