XXL: no fun to work on...that chassis is a pain
Revo: Awesome fun RC to drive anywhere...by no means a racer. It's "slung low" for handling purposes, but it will take anything.
MGT 8.0: If you're worried about parts (locally) this would be lats on my list. A bit of a rarity unless you have a really large inventory at your LHS.

Have you considered the Muggy?

If I was to pick from your list...it would be the Revo all day...but I'd go brushless.