Seriously though, with the Prius's...I'm sure there are more informed opinions here...but I would worry about the battery in them. With a economical diesel or gas car it you won't have to worry about getting the battery renewed in whatever the life is on them. I know that for a while you could get the first gen of the Prius for relatively cheap because they needed the battery restored or replaced.
I tend to buy a car based on driving it till it is dead...not on driving it for 10 years and then selling and upgrading. I know some people just buy new cars every 5 years or whatever. Doesn't make economic sense to me, but I'm sure its bling to drive around in the latest model all the time.