why not start out with 1/10 off road? second hand B4's go for cheap enough on here all the time. Then you can buy your choice of radio gear, and if your buying bits from HK you might aswell add a hobby wing brushless combo to your order and then your ready to go. Start as you mean to go on, racing in a well established class that won't fizzel out once the novelty has worn off.
Thats my 2 pence worth, good luck in whatever you pick!
edit: sorry that sounds really negative about SC trucks, my point is more about if your starting out your gunna need plenty of help and advice which will be easier to come by if your racing in a big class and running a car thats been around for a long time.