as chip says IMo bar the old EGR and secondary air pump problems the suffer from the x14/x16 engines are very good

the cambelt does run on plastic tensioners, which as long as there changed in the vauxhall suggest time/milage are fine (40k iirc)

apart from checking the obvious, there realiable cars, they do suffer from the abs ring in the rear drums do fuck about, only other thing id check is when you shut the drivers door the window shoudl drop down to releave the pressure in the inside (yes really) as the early ones used to blow the rear window out