MAJOR:
Like was posted earlier, if you can test drive it, look for grinding between shifts (fast paced/rushed/redline shifts), ESPECIALLY between 2nd and 3rd.
Worn synchros, requiring a new transmission (or at LEAST updated synchros... but you may as WELL get an LSD in there while its down, etc)
Listen for ticking, or knocking (would be HARD to miss) if the bearings have spun, etc. Its LOUD.
Waterpump (if the car is an early 98, especially). It SHOULD NOT HAVE a black impellar. You can't physically see it without removing it, but see if there is a history of replacing the waterpump, or a receipt with part number. The black ones shatter with hot coolant (get brittle) and overheat your engine. warped heads, etc.
Minor:
Hazy headlights (about $200 for new ones, or CAN be sanded for an 85-90% appearance improvement *for a time*)
bumper sag in the rear (seperating/hanging lower than the trunk, where it originally was supposed to meet up with.
Can be fixed with a couple of tennis balls, actually, lol.
but still something to point out for the price wanted, etc.
sun roof operation/clicking, not opening, etc. $55 gear fixes it.
alignment on these cars are PICKY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Let me think some more.
