SIG sells an electric version of their Kadet trainer, the EP-42B, that comes with a brushless motor and speed controller. The plane is smaller than the Kadet LT-40 though. It has a 42 inch wing span. Picture of www.sigmfg.com product page below.

There's also the Hobbico Electristar (RTF - Ready To Fly) http://www.hobbico.com/airplanes/hcaa12.html that comes with brushless motor and computer radio already installed. All you have to buy is battery packs and charger.

Hobbico also distributes the Flyzone line of RTF electrics http://www.flyzoneplanes.com/airplanes/flyzone-rc.html
These are small and light. Some say they're "toys" but they might be a good choice compared to a balsa plane if you're not going to have an experienced pilot helping you.