[MENTION=1172]Alin[/MENTION] is very correct in requesting a compression/leakdown test. Subarus can be notorious for bad pistons, especially when abused. A good compression test can eliminate a very large headache after purchase. Hell, any car at that mileage I would consider a compression test. Since the belt was done not too long ago, that eliminates that. Take the car to a subaru mechanic or one that specializes in these types of cars and have a very thorough inspection done. Transmission, diffs, clutch, brakes, the whole shebang.
Request a history from the owner, particularly the mods that have been done to it. I noticed there were no pics of the engine bay? That's kind of a major thing so definitely get that.
I won't be bashful in saying the mileage is high, especially on a performance car. That's something you really have to think hard about when purchasing a performance car. It doesn't mean it's nearing it's life's end but it does say that potential problems can crop up more frequently than lower mileage cars. Gaskets, vacuum hoses, brake lines, injectors, A/c, heating system, electrical, they can all start to show their age.
The price is nice and I do love that year car but just be cautious. We don't want you to end up with a basket case and your pulling your hair out chasing down gremlins.