I want to go the the Apple Store this week and pick up a 21.5'' iMac, but I keep reading these stories about screens showing up with yellow tint and a bunch of other scary stuff.
Go for it! From what I have seen and read, the issues are mostly with the panels in the 27" iMacs. You should feel certain that your machine will be great, on the chance that it is not, it is nice to know that Apple will take care of any problems.
I got one last week. I had what seemed to be a video card issue. I brought it back and exchanged it within a few min. I haven't seen the yellow tinge in either of the two computers. I'm happy.