Ken you are right, in-flight adustable prop cannot be registered LSA, at least right now; who knows what the new FAA mosaic rules will allow in a couple of years.
That being said I would stick with a ground-adjustable 3 blade prop like the Whirlwind. For resale engine choice I would stick with the tried and true 100 hp Rotax 912, probably the iS rather than the carbureted ULS. An airplane like that would be snapped up in a blink if priced fairly and equipped with most of the kit options. Personally I would stick with the Grove gear and some tires like the Desser 6x 8.50, 22" dia. To keep the price reasonable, I would stay away from the Monster shock gear and big bushwheels. Those can be easily added later if the buyer chooses. My 2 bits.