Granted, you are a professional when it comes to color, but we warned about some quality issues of the 23" ACDs. I had one 23" ACD, and last summer, decided to add another. I brought the 2nd one home, hooked it up, and noticed quite a color disparity between the 2. The older one (11 months) had become rather pink, with no fix available. Luckily, the Apple Genius agreed it was not right, and they fixed it. However, while running just one screen, I noticed issues with color consistency across the screen of the 2nd one. (move the itunes screen around, and notice how the blue bars on every other song will fade in and out)
I brought that one back, and replaced it with 2 20" ACDs, which dont seem to have any issues. A friend, who didnt mind the repair, bought my old fixed 23"
To note, last week in the apple store, i did the itunes test on a few 23"s, and they didnt exhibit any color issues.
They are great, when they work right, just want you to be forewarned, nothing more disappointing then finally having the "hot setup" of 2 23s and not have them look the same!
EDIT: I have an ATI Radeon 9800 Pro card (got off ebay) and it will allow me to put one, or both screens, in portrait mode. So it is possible, provided you have the right card, to run one landscape and one portrait.
