Louw's last paragraph in his response to you just about covers it all. The Kadet Senior from Sig is a fine airplane but the ARF costs a bundle. I've built three Kadet Seniors and powered them all with .60's but then I fly at an altitude of 5,000' ASL. I've also assembled an LT40ARF and put a .46 in it. Other than the fact that it is a bit tail heavy as it comes out of the box it's a nice airplane too. Depending on the altitude at which you fly and the temperature at the time you fly density altitude enters the equation. 83 F at our airport means an altitude of over 8,000'. In this case more power is required. You should buy the engine for your Corsair at the time you build it and fit it to your flying field conditions. As to the radio a good 6 channel computer radio with 6 model memory will allow you to get by with one Xmitter and then all you have to buy for more airplanes is a flight pack each. Futaba has a new radio T6EXA for less that $200 from Tower and probably the same price at any other Futaba dealer. I can't recommend the Duraplane. Tough but definitely not a trainer.