[VIDEO]http://www.youtube.com/watch?v=Jp8xhutJ-6c]YouTube - Fender Baja Tele with nice out-of-phase sounds[/VIDEO]
Four-way switch to add the option of both pickups in series, plus a phase switch.
I'd actually take the idea further, and get an Andy Summers-style Tele with a humbucker in the neck, and add a coil-split switch to that.
I firmly believe all Teles should come with a 4-way switch. That alone makes them so much more versatile (when they're already surprisingly versatile).