Can't you take your monitor down to 24" and save some $$ and then spend it on 8GB of RAM? As long as you've got a multi-core processor, like the i5, and plenty of RAM, combined with a high quality video card, you'll get good speed with memory hogs like PS and DxO. Going down to 4GB will noticeably slow you.
I've got 24", calibrated monitors at home and work (NEC and Dell) and don't really see the point of a larger monitor for photo images. If you're going to routinely print larger than a 24" screen, then I might understand, but you can zoom in to actual size. Brightness, contrast and color accuracy are much more important factors than absolute size. NEC, Dell, Eizo all make alternatives to the Apple. All are a pretty expensive chunk out of your $2000 budget, but I think you need to figure out how to afford 8GB of RAM.
Dave
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