Sig Citabria
I have one on the building board right now. Not much progress as flying season is in full swing. I don't care for the structural details at all. Too much wood for too little strength. Oh well, it should have a very nice scale outline and appearance, and be a superb flier.
I'm planning on using a Saito 72 that I have on hand. I'm also changing the servo set-up to a more modern configuration. Dual mini aileron servos, pull-pull rudder, split elevator with dual push rods.
Have fun.