If you go from Ofna one thing you need to look at is parts availablity. The Hyper 7 is the moxt common race car from Ofna. You can get the PCR edition or the normal C-Hub or PBS. Not sure the differnece between the PBS and the PCR.
Garbage radio gear is included in all of the Ofna off road stuff that comes in the RTR form, but since your changing that, it's really not a big deal.
I have the PCR and love it. I have broken parts but I am also quite hard on it, jumping garages and stuff. I am looking into a Sportwerks Mayhem as well. I need a race car and a bash car. But I do really love my Hyper 7.