Hey Mike,
Mind If I through in my 2 cents?
The 15 CVX is a great enine for the maxx. It hasa little more torque, and that'll help. If you run it a little rich and keep your spur gear adjusted it shoudl be fine, and will last a lot longer. I've been looking into motors for my maxx for a while now, and the 3 that seem to stick out are the OScvx15 the OScvx15Hyper, and the Picco15. Most of the level headed makers who have lots of experience go with the regular OScvx15 and love it to death.
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Shane
Project MadMaXX
www.4x4LA.com/madmaxx/