2005 WRX Turbo - Good purchase?

We are looking at purchasing a 2005 Impreza WRX Turbo. It does have
122,000 miles on it (I know kind of high for a newer vehicle).

What would be a fair price in todays market, a dealer is asking
$10,000? And what are the common problems to look for with this type
of vehicle? We have never owned a non-American car, what are the
usual repair costs as compared to a Ford or Chevy?

Any thoughts, experiences and input are appreciated.

Thanks.

Lee