Out of the planes you mentioned, the U-Can-Do is probably the most forgiving but it can be fragile and prone to aileron flutter, Personally, I'd choose some sort of intermediate plane. Some examples include:

http://www3.towerhobbies.com/cgi-bin...?&I=LXTXE1&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXDTM8&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXBMM9&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXH755&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXLGM8&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXFKB0&P=0
http://www.horizonhobby.com/Products...ProdID=HAN4100

If you do go with one of the other planes you mentioned, take it easy at first until you get used to how maneuverable they can be compared to your trainer.