First off, do you want a monster truck, or buggy or a CORR truck? Do you want to race? What is your budget? $400 can get you rolling with a bunch of good buggies and monster trucks to choose from- $400 includes total cost to start including fuel, batteries, RTR car/truck with radio- everything.
Go onto
www.losi.com,
www.teamassociated.com,
www.ofna.com,
www.hpiracing.com and
www.traxxas.com to get an idea of what is out there and see what you like.