Make sure the floor plan works for the type of travel that you do. Almost every other thing can be changed as far as colors go but you are stuck with the floor plan and if it doesn't work for you, it can make your travels miserable.
Even if you find the perfect coach, you might want to set aside a few thousand dollars for new tires, belts, hoses, batteries, mattresses, and other incidentals that you may need. If the dealer says the tires are "new" check out the manufacturing date and see if the tires all match. Dealers have a way of switching tires around from one coach to another.