I just recently replaced my old 19 inch lcd with a 21.6 lcd from samsung
Samsung 2253LW 21.6" Widescreen Glossy LCD Monitor - 2ms, 1000:1, 1680x1050 (WSXGA+), Black at TigerDirect.com
Picked that up from tigerdirect and im very happy with it. I do suggest whatever you decide to get make sure you go look at it in person. I read a ton of good reviews on a few different monitors just to go look at them in person and see that i could see the lines between each pixal. would have drove me nuts if i ordered it online without seeing them in person first.
I suggest going with a samsung if you want a really nice looking picture but some of the dells i saw in person were nice too. Stay away from acers they all seemed to look kinda lousy. HPs also looked nice but.... i have seen HP stick there logo on some real cheap low quality garbage so might want to look out for that.