Gateway actually has some nice monitors in that size. Read reviews on the 22" monitors because a friend of mine got one and had to return it cause of the serious bleed out(apparently all the 22" panels are made by the same manufacturer so for a while they all fell victim to the bleed out). I would read some reviews about whatever panel youre looking at and make sure people with new monitors are not having problems with it.
I have one Acer 19" which is pretty nice. There is a little bleed out but other than that the only problem is switching inputs. I have a 360 hooked up to the VGA and a PC to the DVI and switching between them is a pain because the monitor does not have an input switch button, which means you have to go through the monitor's menus.
I also have a 19" gateway which is great. Nice monitor with an input button on the outside
and pretty good menu controls, very easy to use. Gateway also has lots of accessories like speakers, tilt stands and all that if you want.
The friend of mine that returned the 22" Gateway bought the 24" Gateway. This thing is ridiculous! Its huge and has more inputs than my LCD TV. Then again it costs $680.
Acer monitors are pretty nice and they are cheap which for me was a deciding factor. The $50 savings versus the gateway I got definitely shows though.