I have no experience with this airplane, but it seems to fit your requirements.

http://www3.towerhobbies.com/cgi-bin...?&I=LXJ555&P=0

I did build their PT-Electric which is very similar. Easy build and nice flier. It has aileron capability, but with all that dihedral, sure doesn't look like she needs it.

The LT-40 is a great plane, but she won't fly with a .15