stick to sedan and .12. Get an OS to start with as they are fairly inexpensive and easy to tune. If you are going to ROAR sanctioned events just remember to get a 3 port as a 5 port will be illegal. Turbo is legal now.
I would wait for the OS TR R spec. here is the link.
http://www2.towerhobbies.com/cgi-bin...&I=LXGPF1&P=ML
Good luck and be patient.
John