If you don't mind spending the bucks, you can convert most any good .40 size trainer to electric. This will require about 400 to 600 watts of power, meaning a 4000 mAh 4-s lipo battery. E-flite/Hangar 9 makes a few designed for electric ARFs that don't give electrics a bad name and fly on 2100 mAh 3-s lipos.
The Sig LT-25 can be converted to electric and needs less power than most .40 size planes. http://www.modelairplanenews.com/reviews/kadet.asp
I recommend converting a good plane to electric over buying some ready to fly toy, that way you have an electric plane that isn't junk.