I saw both iMacs at a my local Союз a week ago or so, and if I didn't need the portability of a MBP, I'd DEFINITELY be going for the 24 inch.

I agree with illy5603 that larger monitors can take some getting used to, but the adjustment period is short, and the difference is incredible. Whenever I can, I always hook up to the largest possible screen.

I don't think you'll regret the extra investment.

J