diff pin failure is pretty much the same in auto or manual. If you avoid spinning the wheels, it's usually not an issue, or you can do the welded diff pin and not have to worry as much about it.
If you can borrow the car and drive it for a while, that could help. Check the oil when you start, run a tank of gas though the car, then check the oil again. Some Saturns develop oil burning issues. A little isn't a big deal, but you'd hate to get one of the few that burn a quart every thousand miles or so.

If that checks out, should be a great car!