Trucks are cool, but I would build a car. Cars are more aerodynamic, easier to get good tried and true race parts. Not to mention typically are easier to sell when you get ready to upgrade. Don't get me wrong nothing wrong with being different, heck look at me, but a good quality NORMAL race car is a much easier first project. You can't go wrong with a Msss stange, (just can't quit say it, but I'm trying!) Camaro, Monte Carlo, Nova, Chevy II etc..
Take your time and make a good purchase!!!!