Before getting too serious about any airplane (and if there's time) order the FAA CD of the planes history. It has everything that the FAA knows about the airplane. If a current modification needing a field approval or STC isn't on the CD, that can be a big problem. The CD also lists all of the previous registered owners (including flight schools... so he says it's never been a trainer, eh?). Google the N number... you never know what you will find!