QUOTE(Michael Escalera @ April 29 2008, 02:18 AM)

I don't know if the new iMacs would be good for editing....here are some articles you might find interesting.
Apple is sued over iMac colors claimApple sued over 'inferior' iMac screensNew 20" iMac screens show 98% fewer colorsBest Wishes,
Michael
The 20" screens we're inferior on the first generation of the alluminum iMac with glossy screens...i don't know if this recent rev addressed the cheaper lcd on the 20" model. The 24" LCD's are much better. They are not cinema displays, but they are very good.
You could always get the iMac and a second 23" cinema display. You will be able to extend your desktop onto it, and with lightroom 2.0, you will be able to take advantage of the dual monitor support. You can do your main photo editing on the cinema display, then use the iMac's monitor for thumbnails and other editing controls/toolbars. I'd assume you can do something similar with photoshop.
Taking this approach, as suggested above, you could probably get away with the 20" model if you weren't going to use that monitor for photo editing. I'd get the 24 anyway though, if it's within what you are willing to spend.