If you game and primarily play FPS, you want a very low response time above all else to prevent ghosting. As of right now, the Hitachi CML-174 has the lowest response time in the industry. I don't think they have come out with a 19" equivalent as of yet, just 17".
Here's a great place to buy monitors and the price is solid as well $459. You could go dual pretty cheap.
Also at the bottom of the page are links to 7-8 reviews.
P4 2.6C, Thermalright SP94/Panaflo 92MM M1A, IC7 Max3, Swifty MCX159, 1GB Geil PC4000 Ultra Plat, Radeon 8500, Audigy 2, 2X WD Raptor RAID 0, WD 250GB SE, Plex 708A, 166SDVD, LianLi PC75, XP Pro.