RE: which trainer to buy?
All 3 are good planes and you can always sell them to a new guy if/when you get bored with it. If you are willing to do a little assembly, go with an ARF. This will allow YOU to choose plane, radio and engine. With the right purchases, you can continue to move the equipment into future airplanes as you gain experience. You can then sell or retain the older planes at YOUR option. With a computer radio transmitter you can program for several planes and only purchase the airborne equipment (saves money and you stay familiar with 1 transmitter type). Find a local club and get some advise from the instructors there as to brands and type of equipment you will be "buddying" up with for training.