Ive had relatively no preblems with mine. If you get one thats been looked after you'll be fine. You want to look for things such as:
- Rusting arches and sills
- Leaking sunroof
- Gearbox (some can be weak, check for crunching and ease of engaging gears)
- Rough idling, splutering, cutting out (all easily rectified)
- Engine mounts - if there shot gearstick and engine will be flapping about
- Play in steering
Theres a few things, im sure other people will add a few more.