I am writing this post on my new 27-inch iMac. It's just the base model with the dual core 3.06 gHz processor, 1TB drive, and 4 GB RAM. I chose this model because it was a refurb that cost $1450 ($250 less than list price.) I added 4 GB more RAM from Other World Computing for about $100. Of course there are issues with expandability, etc., but it's a very nice machine and much faster than either my 2-year old Macbook Pro or my five year old G-5 Dual. The glossy screen takes a little getting used to -- it's different from the 30-inch Apple Cinema Display that I use at work, but a little attention paid to the room lighting makes it very usable.
As for profiling, well so far I have just turned the brightness down to 50% and made some prints on my 3800 that matched as well as any print can match a monitor. Very happy overall.
Like a lot of staff photographers, I don't have much in the way of cameras or computer gear of my own. (Well, not anything recent, anyway. Lots of old stuff in the garage.) Given the current state of the industry, that's probably not a good position to be in. For me, the 27-inch iMac is an inexpensive way of starting to change that.