I would like an old convertible as a semi-second car. Four seats would be useful - dogs, luggage, the occasional teenager etc. Budget up to £4000-ish. I have narrowed the choice down to a Saab or an Audi 80. I have owned a 1990 Saab previously, which soldiered on to 250,000 miles and which I loved. I have owned a 1996 Audi Avant for six years, so have good experience of both makes. Would you recommend either of these, and if the Audi, which is the best engine option?