I think you should look at LG E2770V. 27 inch FullHD IPS-monitor. I think it will be released next month or something.
I was going to suggest this monitor too. 1920x1080 (probably e-)IPS (W-LED) @ 27". AFAIK LG themselves have said that this monitor is targeted at gamers, price was said to be about $440.
If you want to extend the lifespan of your current monitor a bit, then wait and see what the E2770V brings.
U2711 is also a good choice but it will be expensive and also require far more GPU power when gaming at a 2560x1440 resolution. Also the U2711 has around 30ms input lag whereas the EG2770 is estimated to have around 15ms input lag, which will be twice as fast.
Edited by 4Brand - 4/14/11 at 3:32pm