Yup, it's tough to choose. I want to build them all, but I've got a limited supply of receivers and servos and all the memory slots on the Tx are full. I've vowed to myself that enough is enough and I won't buy more receivers or another Tx. Something will have to come out of service to put a new one in, but that's ok. I've discovered that of the planes I've got flying, only a couple make it to the field regularly. I plan leave the servos and engine in whatever gets sidelined, but I'll pull the Rx and battery out. Shouldn't be too hard to put it in service later. Maybe I'll even hang a couple from the ceiling in my office to irritate the wife.