After 20 years of reliable service, my beautiful 1991 Volvo 940GL estate is finally reaching the end of the road, and I need to buy a replacement, of similar quality (if possible!).

New cars are horrendously expensive here in Portugal where I live, so it will have to be a used one, maybe 2-3 years old. Here are my requirements:

Annual mileage - less than 10,000 miles.
Size - not small, but does not need to be as big as my Volvo.
Body - estate preferred, but not essential.
Fuel - any
Quality car with plenty of life left in it.
Budget - about 20k.
What do you recommend I buy?