Wiring

[Dafni]

You can also send Mike an e-mail with your list, if you want some extra-ordinairy parts (he can get you most anything RC-related)

An UBEC is a good idea. I would recommend it.

I assume you have a 51t mod1 spur, right?
You could calculate the gearing yourself, or use one of those spreadsheets that guys made and contributed to the forum.
I guess your motor should be able to push your maxx to 40mph without much worries. Mid 30's is a good starting point.