Thanks...
I shoot primarily for B&W, and I'm worried about having decent linearity in the image, especially into the highlights, where I've had trouble in the past getting the monitor to fairly represent the file.
I do end up with a lot of color images, but all of "my" work is the B&W...
I'll look into it a bit more, but I think the iMac is going to be the computer to get for me.
---Michael