RE: Buying a new buggy.
Well since you said you are probably getting a Hyper 7 here are the choices if you don't know them already:
theres the RTR Sports the most basic of the RTRs
then the PCR RTR which is another RTR Hyper 7
and the latest of the RTR Hyper 7s the PBS (i got this one for Xmas, its Great!)
there is also the Pro which is a roling chasis like most other Pros