Gorilla Maxx

[BP-Revo]

I'd go for a G2R conversion, then grab an HV4.5 or the Monster Maxx (when it comes out) later. The MonsterMaxx is going to be faster but will take a greater toll on the drivetrain, and may possibly require you to get upgraded diffs and CVD's, whiile all you will need is a good slipper and steel idlers with an HV.

Also, even a stock powered maxx can wheelie in second with good packs, so with any burshless system you should be able to blackflip in second at the very least. However, that will be reduced with either GorillaMaxx kit because of the low CG, and especially with the G2R because of the longer wheelbase and the suspension.