I own an '89 LegacyVZ in New Zealand. Price seems good for what you'd pay here in Perth Australia, but in NZ beieve it or not your car would go for $3500! In shopping for my '89 I drove several '91s and '92s. They were all generally in good shape, with many 'problems' in common.
-visors deteriorated so that they don't stay up
-steering wheel rubber grip is loose
-rear wiper and water pump don't work
-passenger electric window motor dying
-thermostat problems leading to blown radiators
So keep an eye out for these problems. Make sure timing belt was changed at 100,000km, keep an eye on the temperature gauge, watch for cracks developing on the non-radiator-cap side of the radiator, just below the overflow plug.
John