I have a 172T Samsung 17" monitor.
To be honest I think I'll use it for everything but gaming and keep my 19" Samsung 957DF CRT for gaming.
With a response time of <24ms it still suffers quite noticeable ghosting. I'd look at AOC monitors. Their colour reproduction might not be as sweet as the Samsungs but they have ~14ms response times which will result in little or no ghosting. The other limiting factor to consider with LCDs is the fact that they work best when running in their native resolutions (1240x1024 for a 17"). Also I recommend using DVI connection if your graphics card supports this, as this will give you the clearest, best image on screen.
CPU: Intel i7 2600K @ 4.6Ghz
Mobo: Asus P8P67 Pro B3 Revision
Mem: Corsair Vengeance 8GB (2x4GB) DDR3 1866MHz
Video: 2 x MSI HD5850 Twin Frozr II (CrossfireX)
HDD: Crucial C300 128GB SSD, Seagate Momentus XT 500GB
Sound: RealtekŪ ALC892 8-Channel High Definition Audio
OS: Windows 7 Home Premium 64bit