If you run a car from a manufacturer in another class that you're happy with, you'll probably be happy with their 1/12TH car too. AE and CRC are the most readily available. I like Serpent, though lately I've been playing with a BMI and am pretty happy with it. Jason at BMI provides the most personal service I've found. That said, I would see what some of the good racers at your track are running, if you have a problem it's nice to have someone who understands your car and can help you deal with it.