Currently, I have a 20" Widescreen Dell Monitor and it works amazing. A single monitor isn't enough now since I'm wanting to dual screen. I've been looking at Alienware's 21.5" OptX AW2210 as my secondary monitor. Also, more or less, one monitor will have my Xbox 360 hooked up to it as I feel gaming on a monitor is a lot better than on a tv. Besides the AW2210, what do you all think? Any recommendations for a different 20 - 21" Widescreen flat panel LCD?
To be honest, anything branded with the Alienware name is horribly overpriced for what you get. For nearly $100 less, you can get a Samsung 2343BWX, which will serve all your gaming needs without issues. The only thing the Alienware has going for it is the multiple HDMI inputs, but you could pick up the Samsung T220HD instead which would allow you to connect both your computer and your X360 to it.
Did I mention that I love Samsung monitors? Below is a picture of what my desk looks like at home - three Samsung 2443BW screens.
Why not get a straight Dell screen then? That's all the Alienware monitor is - a rebranded Dell SX2210. You'll save yourself the money of the name brand, and likely get a better quality screen in the end. You won't have the full 1080 resolution if you pick up another 2009W, but the aesthetics of having the same monitor on your desk is worth it in my opinion. I used to use two different models of monitors a while back (two 20", 1 24"), and the evero-so-slightly different heights and bezels drove me insane. That's why I went and dropped the dough on the three Samsung's I have now.