I have a 1988, bought it maybe four years ago and it has been a lot of fun.
Another thing you need to check is the head bolts, which were probably replaced as part of a recall. Remove the oil filler cap and look in inside the valve cover, I think down and to the right. You will see one of the head bolts and the new ones have a head that looks like the tip of a large torx screwdriver. If you have the old standard head bolts, they need to be replaced.
That said, unless you have a garage, nice set of tools, some patience, and are a good at working on cars, you could end up spending a lot on minor repairs. This is mainly due to the age of the car, as someone else said the belts and hoses and anything else rubber will probably need to be replaced soon. I've also had some minor electrical problems in the past which were tough to track down with the numerous relays.
Sometimes when working on my car I have thought there was some Rube Goldberg engineering involved. The germans couldn't do anything the easy way. Then again, when it is running properly it is a really good ride.
Christopher