I would have to politely disagree with the HP recommendation. Do some searching on monitors in your size and price range and you'll probably see a lot of positive reviews on LG monitors.
I think you should strongly consider choosing a 23' monitor since this is the sweet spot for getting a higher resolution than you would otherwise obtain. Check into this model specifically: W2361V or VG (matte or gloss). The colors are vibrant and uniform with no bleeding. Besides a fantastic image, it's got multiple connection options including HDMI. I've got two on my desk flanking my MBP.
Oh, I should mention that it will run you approx. $30 over your budget (see Best Buy), although you might find a bargain online. In this price range, there's nothing better.