RE: Radio and engine needed
This is NOT a plane for a beginner. You are spending an awful lot of money on something that, if you have never flown or qualified on a trainer, should never attempt to fly. I am not sure if I would try it and I've been doing this for several years now, and fly 90 size pattern planes!
With that said, the best choice, in my estimation, is the DX7. Spread Spectrum is the way of the future, that's for sure. You could use it on a trainer also, then have the expandability for what you want to put in the Phaeton 90.
Refer to the beginning thread written by RCKen about trainers and what to get. The choice is almost overwhelming.
DS.