I'm running a Futaba 3PM radio with HRS. For servos I'm using 9451 on throttle & a 9550 low pro for steering on my r40. For me this is an awsome set up. Way faster than ppm with 3003 servos. If cost is an issue digital may not be the way you want to go since they are damn near $100 per servo. Also they do suck more juice from the battery but I always use 2 sets per race day any way because batteries suck. So far I've done a full season with this rig & no failures yet.