if you want a bigger sized screen while gaming, i suggest getting a nice sized 1080p HDTV as a 2nd monitor for gaming. since the resolution is only 1920x1080, your games will run better, but still look great.
For price of a good 30in monitor approx $1000 and up, you can get a nice 37in HDTV for gaming, and a 24in monitor for standard desktop usage.
BUT if you're hell bent on getting a 30" monitor, i'd recommend the samsung
http://www.newegg.com/Product/Product.aspx?Item=N82E16824001098
this is more preferable than a Dell Ultrasharp 30in, which is an 11ms LCD, and not that great for gaming.