What can be expected for about 12,000 euros?

Hello, I would like to spend about 12,000 euros on a used Alfa 156 diesel. Preferably as SW. What can I expect for this money? Year of construction? Engine (1.9 or 2.4)? Running performance? Equipment? Condition? I drive about 30,000 km per year, to 95% highway and the car should hold so about 4-5 years. My current car is a leasing vehicle and goes back to the dealer at the beginning of January 2006. With a mileage of 90,000 km over three years Leasing is unfortunately not so profitable anymore. Thanks for the information! Greetings Marco