There are a lot of things to consider here. First and foremost, I agree with the above commenters - get a feel for Motoblur and see if you do actually like it. I was pleasantly surprised by it; I don't mind the "mash all my social contacts together" contacts app, as I can just hit the dialer and get my "only phone number" contacts, I LOVE the way you can zip around the home screens at the bottom, and some of the social integration widgets are okay for what I want to do.
There are, of course, drawbacks to it as well, some dated features, and some just plain annoying design choices, such as not taking advantage of the higher resolution of their awesome hardware! This is the number one advantage to going to Launcher Pro imo, as you can change the number of rows and columns on your home screens, thus getting over twice as many icons on the screen at once...pretty awesome stuff.
Anyway, I digress...You actually can remove a decent amount of the Motoblur framework by renaming some of the apps in the system partition from .app to .bak (NEVER delete them, Moto checks these files when doing firmware updates). Only do this if you've done a lot of research and absolutely know exactly what you're doing. Personally, I'm just making do with Motoblur right now, since running LauncherPro's widgets while Moto's framework is still running in the background seems counterproductive, and I don't want to mess with my system partition......yet. Hope this helps, sorry for the wordiness.