I love my LCD, and I game with it all the time. Ghosting isn't much of an issue for me, but I also have a high-end model. There are new models on the market (Hitachi comes to mind) that boast a 16ms response (rise+fall), which is excellent. Even mine at 25ms was considered fantastic at the time.
As far as playing at non-native resolutions, a good LCD monitor will scale the image smoothly so little or no distortion is noticeable. (At least, mine does.) Otherwise, if you reall want to nitpick about it, just make sure your PC has enough power to run games at the LCD's native resolution (which for an 18" LCD will probably be 1280x1024, 19" and higher will probably be 1600x1200).
The lower heat and lower power consumption are nice, too.
