I am doing some serious shopping on this and the numbers hurt for the AlienBee stuff. Between the lights, power supplies, light modifiers triggers, and stands it will be at least $2000.
I have seen people use 2-3 speedlights to shoot cars.
I thought about picking a few of these up, some soft boxes or umbrellas (whatever is better) and seeing what kind of damage I can do:
http://www.amazon.com/Yongnuo-Professional-Speedlight-Flashlight-Olympus/dp/B00BXA7N6A/ref=sr_1_1?ie=UTF8&qid=1414669396&sr=8-1&keywords=speedlights