If you're willing to spend $350 you could definetly get a 19 inch monitor. I have the Sony 420 GS, which is about 2 years old. This is my second Sony monitor, and I think they are the best by far. Very clear image, very flat screen and nice colors.
I don't know Sony's current model numbers but I've seen one of their 19s for about $330. That's the 1 I would get.
PS - resist the urge to get a Viewsonic, they are just not as good.