the .46 size u-can-do is a good choice. That is what i use to practice to hover with, it sells for $160 ( I think) and will do fine with a O.S..70 four stroke or a YS .63 fourstroke. I would reccomend the ys, but it is a little more expensive. At my field in FL, everyon ehas one because they saw how well that mine flew, but they dont have the right equipment to make it really perform(good engines, servos, and control rods and linkages) Anyone can fly it, some one at my field is actually using it as a trainer!
You can buy it on eday, and have it flight ready the next, i got mine monday, and it was flying on tuesday! Just make sure that you balance it at a little less than 6 in. on the LE!!!