[Arct1k]

AX10 - Good start - but get expensive to make robust and comp worthy - if you get hooked thats a lot of cash down the drain as it'll won't get all the way
LCC - Better start - worm gears and built in dig - less upgrades required (still shafty - but comp worthy)
Bully - Better start - Comp worthy, cheap bit heavy, more complicated as build your own but packages now available
Berg - Best Start - Comp king, most expensive, more complicated as build your own