Vacuum Cleaners Discussions

I have a Lux Epic 8000 canister, and the motor is gone. I'd like to replace it with a more powerful motor and I know this will require some modification. Yes, I'm talking about a "bojack" procedure. I'll probably raid the boneyard at my friends vac shop for another motor. Has anyone ever done this? Any suggestions for what brand of machine I should look for to pull a motor from? I really don't want to replace it with the same motor because I never thought the original motor was strong enough in the first place.