If you have not decided what can you will get, well, I can guide you to some considerations that you must think about, such as.;

1. Are you going to get the RTR or Kit version.
2. Will the car be for racing (NTC3) or for bashing (4TEC) or both,
3. Make a detailed comparison of specs for both cars,
4. Adjustability and tunabililty to various race track conditions,
5. How durable is the car, ask for some feedback or comments from other users.
6. Parts support, is your LHS be able to get the parts for you.
7. How much are you going to spend for the brand new kit.
8. How much are you going to spend for hop-up parts.

I have an HPI RS4 SS so I cannot comment what will be the car that will most fit your requirements.

Hope this helps.