As above.
Never owned a Calibra, but owned a big power V6 Cavalier, and it was super reliable.
A 2.0 8v is by far the best of the lot for your wife. The engine is simple, cheap to keep running and works a charm. Being more basic (as its older) you get none of the super fancy injection crap associated with newer engines.
They're also cheaper as most tend to go the 16v/turbo/V6 route too.
They're not the best for kiddies, but ideal for occasional family use.