Also, keeping a trainer or 2 as backup in case of an "incident" is a good idea. I keep a couple of "HOT" spares, 3 actually but 3 planes are on the same TX. The 4th is on an older AM set that I buddy up and loan out on occasion. Still have a memory slot open for the plane on the build board now. As Dirty Harry said " A man's gotta know his limitations", and then buy more radios.
Yep, Yep, Yep. Looking at a 7C or 9C for down the road.