Cyclone S. i think they are a 150$ and very capable and upgradeable down the road.
We run a 540 spec class bassed soley on box stock Cyclone S chassis. Our local a-main winner took it out to our 13.5 class just to prove its capability. First night out with just a tire change and motor change, he placed the car 2nd place. This was with no track time and no setup or hopups. 150$ vs 500$ cars that nite. It was just nice to see that cheap does not equal slow.
Other considerations are full out pro level cars, buy once. TC5,Xray 007-009,cyclone TC ect ect