I want a new radio system for my savage but I am not sure which one. The spektrum dx3 seems great and all i need, but I was also looking at the airtronics m11, the spektrum dx3r, and the futaba 4pk. What are your oppinions? Are these all synthesized? I'm leaning away from the m11 though and more towards 4pk. Do I have to use digital servos for any of these or is there the option of normal servo use. Thanks