Personally, I don't care for the shiny / glossy ones. All I see is the damn reflection.
Yes, a matte finish is a must for me as well. It's a shame it's not a listed spec for most monitors.
I'm very happy with my 21.6" Asus VH222H (1920x1080). I might have gotten a 23" monitor, but it wouldn't have fit on my desk. I also could have gotten a 22", but all of those are only 1680x1050, and I'd rather have more resolution than slightly larger physical size.
Ignore response time specs, all monitors in the size range you're looking at will be fast enough. Ignore contrast ratio claims, they get blown out of proporation easily.
Keep in mind dead-pixel policies. Many shops won't replace a monitor for less than 7 malfunctioning pixels, even if they're right in the middle of the screen. (Mine has a single bright green sub-pixel, but I have trouble finding it even when I look, and it's not near the center of the screen.)
Whatever monitor you choose, make sure you calibrate your monitor when you get it. The difference between the default modes and what I eventually settled on is huge. My monitor went from huge areas of backlight bleed, and kinda washed-out color, to fairly nice blacks (for a sub-$200 monitor) and gorgeous color. Just remember, Contrast controls white levels, while Brightness controls Black levels. You want to set contrast as high as you can, while still being able to distinguish between the brightest whites, and then set the Brightness as low as you can while still being able to make out the difference between dark colors near black. I also had to adjust the colors individually to keep green from overpowering blue.