Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Was going to get a 21.5, but went with 27" due to the ability to connect my xbox.

Now having the 27", I went into the apple store and saw the 21.5 and it seemed tiny. I won't be going smaller in the future. Future desktop purchases will need to be AT LEAST 27".
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.