With that budget get a team magic g4js. Fully upgradable. I am more of a xray and mugen guy myself but with that budget the G4js is probably the best car kit for you.
heres a link to the g4js
There is also the g4jr it is the rtr version of this for 309.99.
Like i said i like the mugen and xray cars so i would say wait till you get enough cash and get that but with the budget you stated these would be my choices.
Thr only downfall to these cars is that i belive only wolf hobbies sells parts for them, so you are going to want to stock up on parts if you go this route.