Looking for a something for Wendy and I to gently cruise about in on the nice sunny days (and where 4 seats and a boot might be handy!) but have no experience of Mercs whatsoever. Would like to keep the budget to 16k and dont really want one of the big engined cars since we are not really looking for any great performance. (just for Rossybee's benefit.. that means things with 3,4,5,6 litres are a no-no

There are a lot of cars within the budget with 50-70k miles on sale. I take it that, if serviced properly, the mileage shouldn't be too much of an issue?
Also, some are advertised as 'Elegance' trim and others as 'Avantgarde' but its not that easy to see what is so different. Is one better than the other?
Auto/manual .. instictively I think it should be an auto
Open to (sensible) advice.
Jim