Well, if you go with the Novak, you're pretty much stuck with the Novak stuff. If you go with the non sensored stuff, and you get a MM with an 8XL, later on you could get another controller like an MGM or Quark, or you could add to your battery of motors. You'd really be surprised at how much fun a low turn motor (9XL or 10XL) can be on 4S when you get into running in a place where speed gets you nothing, like through rocks or hill climbing.

Personally, I have a bunch of motors. Different motors for different purposes.