I'd say go for the iMac unless you need portability. Use the money you save over the MBP to buy yourself a Time Capsule to backup your work. If you are worried about display accuracy then by all means buy a second monitor - would probably still come in cheaper than the MBP and in my opinion would be better value.
In any event, welcome to the Mac!
Enjoy!
Craig.
In any event, welcome to the Mac!
Enjoy!
Craig.