A MacBook Pro running at 2.16GHz with 2GB of RAM is a very powerful choice, most people will probably be able to run LE quite well with no problems. But my suggestion would be to wait a little while until Apple releases the new Intel-powered "PowerMac" equivalent desktop computers later this year (perhaps sooner rather than later; the Apple Worldwide Developers Conference is in early August and the new desktops may be introduced then). You never want to run out of CPU power at anytime, and I (on a PowerMac G5 with 2GB RAM) run out occasionaly, which is very frustrating. This only really happens when I am running tons of CPU-intensive plug-ins, but I want to be able to run as many plug-ins as I feel I need, so I think the Desktops when they are released are the only totally-sure bet to make sure you can use ALL the functionality of PT LE with the 48 stereo tracks allowed by purchasing the Music Production Toolkit.
Wait for a few months if you can just so you can check out the new MacIntel Pro Desktops, they should be here soon! Then make the decision; who knows, they could introduce even faster MacBook Pros by the end of the year....
Oh, and you might want to check out
THIS THREAD on how fast the MacBooks are supposed to be... many people said that they were more than sufficient....
Cheers,
J.D.