I'd be leery too, about a deal on a performance car. If it is an individual car, there will be a problem somewhere. Even if the entire model-year is below what you'd expect, there's likely a reason, as mentioned above.
25,000 miles on a 10 year old Porsche is not un-heard of, but keep in mind that's not likely the same as it would be on a Toyota of the same vintage. Likely harder miles. It's been said a lot already, but when something goes on a car like that, best have some funds set aside. Or room to re-finance your mortgage!
Just throwing it out there (because I know more about this car than most Porsches or even the 370Z yet), but try an Alfa 4C while you're out kicking tires anyway. Not as practical as a modern Porsche (but you wanted the small form-factor non-GT car anyhow), but very pretty, still new enough to be under warranty, more economical to fix (it isn't a FIAT, but it does share parts with other FCA cars - only the labour is typically more at dealerships). Might still be a bit out of your price range, but give one a test drive before you decide.
http://www.zeperfs.com/en/duel1727-4686.htm