I was looking at power options for my 9-10lb NitroPlanes Seawind and came up with this:

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXLWV7

Already have a Saito 100 set aside, but since I also run 450-600 class electric helis, have most of the electric gear handy.

I cannot remember if it was in this thread, but there was someone out in California that electrified his a while ago. I imagine the motor and ESC options are even better now.

As for retracts, the sky is the limit. Along with the Eflite 60-120 units I have mounted in mine, (approx $180 CDN for the main set) there are now electric versions of Robart, (I believe in a cooperation with Down & Locked) and Century Jet is doing conversions to their own and other mechanical setups.