Mike,
Welcome to almost Comanche ownership. 400s are awesome machines - raced one once. Have the Twin in the photo so I'm not as close to 400 owners.
FYI. About 150 400s were built and about 150ish 39s, were built, I have a 39. 39 is the factory counter-rotated Twin other PA30s were field converted to counter-rotated.
IMHO. Depending upon the quality of the repair, a 400 with damage history can be in better shape than one with no damage history. Whatever path you take, be sure to get a pre-buy by a good Comanche knowledgeable. Once you buy, there's a great Comanche ownership course you will want to take.
There are active 400 owners that do come to the electronic Forums. If you want to talk with a very knowledgeable owner that stays in touch with a lot of owners, you might try Matt Kurke at
http://comanchegear.com/