If you are gonna run on a track and you could think you might join a weekly race or something....dont buy hpi or traxxas. It's discouraging to go and find out you NEED a whole new car to compete. At least you can be very competitive with the LOSI or TEAM ASSOCIATED rtr's, which are about the same price. If you just want to run on the track for fun now and then, any would really work.
BTW to get the best out of the BL systems you need a Lipo which you'll find might cost as much as or more than the car.