MacBook Pro should handle the software, no problems.
But I sense that you're going to miss the larger display of the iMac -very- quickly.
For audio production, the larger (and wider) the screen, the better.
Although, if you do get the MBP, you might get a separate display to go with it.
For audio production, one of the new 29" "ultrawide" displays might come in very handy.
I use a 27" "mid-res" display, the Viewsonic 2770 -- very nice for my "older eyes", but younger folks might find it "too grainy"...
A good starting point for the monitor search is this page:
http://www.pchardwarehelp.com/guides/s-ips-lcd-list.php