Doing the 9mm bearing mod like I did in that thread is real cheap and will take care of the main bearing problems. Id do that mod along with vp trans housings and save the money on motor plates and put it into knuckles, c's and lock outs.
Moa's are more capable that shafty's for sure (depending on how you setup your electronics and how low you keep the cog) but if your not comping, ever, than it might be a waste of money.
Well not a waste of money because if you really enjoy crawler bad ass obsticals, the xr will out climb your ax10 which as long as you are really into it then its not really a waste of money.