I think about what I have laying around, engines, servos. then I pick a plane that will work with them. But recently a flying buddy
dumped his 29% mx2 and damaged the covering on the fuse and tore up the right wing. He gave me the plane and a ZDZ 40cc
with prop spinner and Pitts muffler for $100. The right wing will cost 50bucks for a new one and then some nice high torque digitals.
So i guess sometimes the plane chooses you too.