Which used Citroën C5 hatchback should I buy?
Go for a model from after 2004, when the C5 got a facelift that improved the styling, as well as boosting kit levels and addressing some of the car's reliability problems.
Then pick a diesel. The 1.6 is the smallest available, but its 110bhp hauls the car well and economically. Otherwise, pick the 136bhp 2.0 diesel. If neither suits, the 1.8 or 2.0 petrols are reasonable choices, but steer well clear of the 3.0 V6 because it is thirsty and dear to insure.