Other things not mentioned in the ad to keep an eye on as they wear and need replacing:
- Flex disc (guibo)
- Propshaft bolts can loosen over time, need checking
- Front wishbones ball joints, even small amounts of play translate to large amounts of knocking over bumpy surfaces and results in steering feel that isn't as composed as it should be
- Rear brake lines behind the fuel tank do corrode if left untreated/cleaned. This is quite a big job actually and typically the fuel tank has to come out
- Front arch rust from the inside. At this age they will all rust. A new wing is over £400 from BMW unpainted. Used wings will just rust sooner as they will all be of the same age.
Some other bits too which I've covered in this thread! With your kind of mileage though you probably won't see most of these issues.