hey dogbones, i have the srx aggressor ch70 75.590. i was looking to improve it to a spektrum and did some searching and wasn't 100% on which one i need. the price was about 140(can't be sure), i know that this radio is only worth 120ish, so is the spektrum module and rx worth it over getting a new radio for 200- 250. I like this srx and only race once a year and would also like the telemetry (lap counting) module if it will work because i own my own track and race here lots. Thanks Dan