The setup I would recommend would be dual elevator servos, dual flap ( set up for no load when flaps are down), dual aileron, separate rudder and tail wheel servos (this is to take the shock load off your rudder servo), dual batteries, dual switches. all metal geared. This is simply for safety sake and gives the best chance if some thing was to go wrong. The hitec 5645 servo will work well for all your surfaces and cost about $45 each. Skimping on the radio equipment is a bad idea. I would run something like a Hitec 5245 on the throttles, gear and choke. The metal gears are there for vibration as well as being strong. A 6V system would be the way to go as well as 2.4 ghz. Its not like this is a budget build anyway.