I'm hoping to sell my current laptop and that's the only instance where I can afford the MBP purchase. As for a new imac--I do some graphic design work and I can't deal with the glossy screens on the new macs, so I need the previous generations. Portability isn't really something that is a must, but it's nice to be able to unplug my laptop and take it downstairs or to a friends house.
What type of GFX work do you do? If it’s low end stuff then I doubt it would make a huge difference, also I'm sure I’ve read that you can calibrate the monitor to make things look right/better