Manufacturers new or remanufactured engines are the best way to go invariably cheaper over the medium term.Avoid American overhaul shops at all costs U.K. rebuilder engines can be O.K. but often don,t work our any cheaper especially if you consider all the new ancillaries that come with a new or Remanufactured engine from the factory.I have always had good backup from the Old Yorkshire Light Aircraft (now Multiflight) for my engine purchases don,t know what they are like now!!.Shop around ,check prices and what you are actually getting.