My suggestion :
Low cost 2WD, Team C TC02T
High end 2WD, AE BB4
RTR 2WD, Slash
RTR 4WD, Slash 4x4
All available on RCMart.
Not sure spare part for Team C and AE.
But for Slash, don't worry, plenty supply, and cheap !!
levinng:
Suggest you to play 4wd first because it is easier to drive. it will keep your interest in this hobby. You may consider kyosho zx5 rtr readyset. it all depends on your budget.