Dell's u2312 and u2412 are good for gaming on a budget. I'd start there. There's also the hp zr2440w, zr24w and, zr2475w (which are all very similar)
If money were free, the best one on that site is probably:
http://www.ebuyer.com/261325-hp-zr30w-30-lcd-dvi-d-monitor-vm617at-abu
but assuming a reasonable price range you might prefer this:
http://www.ebuyer.com/204376-hp-zr24w-lcd-ips-24-dvi-d-monitor-vm633at-abu