Which engine for the 9-3?

Hello, I intend to buy a Saab 9-3 and drive for a very long time. The most important criterion for me is the longevity (not power) of the engines. Which would advise him: the new 1.8 l petrol engine (without turbo), 1.9 tid with 120 hp or the 2.2l tid with 125 hp Thank you for your help!