s corp partnership, that way if something happens to one, they can't touch the assets of the whole, and your taxed once. also, never personally guarentee anything if you can avoid it, this will render the corp useless and able the party to sue both the corp and you. Make sure you always document your meetings and make shure to have them! Otherwise, in court it would apear that the corp was just a vail! even though it is! hope this helps!