Get a .20, you don't have to fly at full throttle all the time, and you'll have power to spare for when you need it. Probably will help out with the balance too.
As far as my .02 about radios, quote from post #126:
ORIGINAL: Me
Radio - Spend the money on a 6 channel(or more) computer radio!!! If you have any plans to stick with it, you(and your planes) will "grow" into it, and they have great features that help even from the get-go. You can buy one for not much more than a four channel, and the benifits(and convienience) vastly outweigh the cost. Most have multiple model setup memories, so as you aquire more planes, you can continue to use the same radio without having to buy a new transmitter everytime(you'll still need servos, receiver, etc).
You can pick up a flight pack, receiver, servos, switch, battery for $80-$100+ new, cheaper used from a
reliable source. NOT EBAY.