bigmo, only one of the Hitec models is compatible with the Spektrum module. I think it is the CRX, but if not it is the SRX. I can't remember which right now...brain too full, need beer...!
And, RC10, yep, those are the only ones compatible with the Spektrum module, for now, and according to my LHS, only the M8 module is out onthe market so far.