e-starter would be an excellent next plane. Of course you will need to by a radio.
the Magpie or the Smooth-e from
www.mountainmodels.com would receive my highest recommendations as they are availalbe with 3 channel AND 4 channel wings so you can just swap the wig and change the plane's character.
If you want something big, look at the Multiplex Magister.
More along an e-glider, look at the Multiplex EZ glider electric.
Hope these were helpful.