Forester, hg issues on the later models as tlag says, early cars not so much but it's a noisy engine, an sf model may be getting a bit long in the tooth for your needs, self leveling suspension will have had it by now, youll be able to tell by looking at the back end if it looks like a dog sitting down then walk away, plenty of aftermarket eeplacement shock options though at a third of the price of subaru ones.
The ride comfort is lovely and smooth for the type of car, the newer model also sits about 2" higher than the sf.
David's had a foz and now on his legacy so is better at the pros and cons of the sg model forester vs legacy,
Sg model will be a better option and as long as it's been looked after should last forever, but as the others have said a leagcy would be a more suited choice,