As far as hardware, I cant tell you anything more than whats already been said. However, I teach for the club and found that senior members tend to gravitate to a .60 sized trainer. My personal all time favorite is the Hobbistar .60, very stable, and durable. The Kadet is great too, especially the senior. One thing to note is the larger trainers can handle higher winds and penetrate better. Those students usually stand down around 18mph.
Edwin