I'd go with the imac. Why pay $1100 for a 23inch screen when you can get an imac with 3 inch less screen for the same or even cheaper price than the lcd alone. Even with the price drop i think the ACD's are just way too overpriced. If you really need an lcd down the road you could always sell the imac later. Just think of if you really get into pro apps and you need a more powerful machine AFTER you've purchased the ACD. Are you going to take the ACD back and pay the useless restocking fee? In reality the macbook can't really cut it for pro apps. Yeah you will have one nice screen or you could have your macbook and a very nice 20inch imac that can run pro apps natively. I vote for IMAC.
now it would be a different story if you had a powerbook or MBP