27 inch with quad core i5, love the screen, this machine is quick, i am using it primarily for photo and video editing, i have loads of DV tapes to convert to digital media, when i got the mac book earlier and used it for some photo editing i was amazed by the ease of use, i wanted a bigger screen to do all that stuff and of course more powerful machine.
There are some problems with Imac as posted here but Apple really take care of customers as i have learned in few forums and PCworld report on customer satisfaction on Apple notebooks and desktops was ranked best against competition.
I have never used Mac before but have used Ipod and Iphone, i never think i will buy PC for personal use. My Imac is working great, the looks are awesome i am very surprised not many people know about apple products (mostly desktops) i have one keep asking me where is the cpu of Imac i have hard time believing everything is build in one big screen.