Desktop Gaming Monitors

Hey person who is reading this, I'm looking to upgrade my desktop monitor for gaming and would like any positive feedback. My current build is an Intel 2500k not overclocked, EVGA Nvidia gtx 570, and well I'm not sure if you need to know anything else about the computer except those two things. Anything over 25in. for the monitor would be good and I'm definitely interested in the 120hz monitors. Also, I really don't have a set budget. So, that's all I got, and thanks ahead for any help.