I just came from my local Apple store, with the intent of buying a new one today. I didn't. Why? I literally walked up to a new 24" with Aperture installed, fired it up, Aperture that is, and it froze within 2 minutes of use. The "genius" promptly shut it down and explained that people play around with these a lot, and that's usually the issue.
It restarted. And lo and behold, within maybe 5 minutes of browsing around, and once again, it froze solid. This time when launching iMovie. The "genius" explained that they have been having problems with this one, and that the other 10-15 in store are fine. Also proceeded to tell me they have never heard of a "Freezing" issue with the iMacs at all.
This really disturbed me. I came home empty handed, and frankly, it's pissing me off as I NEED a new machine, and I WANT a new iMac. However, there is NO WAY I'm dropping over 2K for something with this many issues.