Newbie need help :)

[pullstarter]

Hey Guys,
I'm a Gmaxx and Revo virgin so would appreciate some help, considering building up a G3R and have a couple of questions,

Firstly, wold it be hideously expensive to build up a G3R by using new revo parts or is it best to get a Revo donor vehicle?

Secondly, i've been looking at the V2 slipperential and want to know is this a stand alone unit or do i still need an emax tranny to run this? (I'm guessing its stand alone by the looks?)

Thirdly, whats a good motor esc combo for 12 cell nimh?

Many thanks
Simon