I guess just reading through threads in here will give you an idea of the common faults.
Not sure how long ago it was when you were 17 but they are all getting old now, most are 20 or 21 years old. So there are some pretty tired ones about and some rusty ones too.
Gearbox problems and charger problems are the main things to watch out for I guess. Gearbox, just check for noises, whines etc... on test drive, make sure it goes into gears easily. Charger, look for excessive oil in the boost pipes and any dodgy sounding noises.
Have a good look at chassis legs yes.