Curious.... did you finally buy a Prius?
Got mine used in August (2005, loaded, 126k, 1-owner, dealer-serviced). I've put 8k on it since and the MPG is 49. Handling-wise this vehicle drives like a boat but I'm after the fuel efficiency. Quite impressed by the design - no starter, no alternator, power steering and AC are electric, accessory belt runs only the coolant and brake wear is really slow due to regen braking. I would be happy if it goes to 200k before major repairs (main battery, trans-axle, inverter).
BTW, I wouldn't pay more than $6k for mine.