MacBook Pro can handle it
I'm running a MacBook Pro, 2.66 GHz Intel i7, 8 GB RAM with Parallels 6, Windows 7, 64 Bit (4 GB), AutoCAD 2011. I have experience working with AutoCAD 2006 - present on a PC platform, as well. There is a negligible delay in AutoCAD (less than a quarter-second) between touchpad movements and the response in the software. The biggest issue is the multiswipe zooming, which, while supported in Parallels, is poorly interpreted in AutoCAD.
I've helped setup other macs with Parallels and AutoCAD. You NEED to spec out your computer. Anything less than the 2.53 GHz Intel i5 and 4 GB RAM has a delay and decrease in graphics quality.