You might be able to pick up a decent 250 CDI model for a good price. The most sought-after model will be the 350 CDI. Mercedes owners are proud owners so it’ll be highly irregular if you are looking at a CLS Shooting Brake without a full Mercedes service history. High mileage models might put you off, but the engines are well proven, so you can expect decent reliability.
These sorts of cars will be a rarity but potential buyers more so. That means owners and used traders will be prepared to negotiate on price.
Spend money repairing minor dings and scuffed alloys – any potential buyer will run a mile if confronted by a car that doesn’t look anything other than top-notch. A full Mercedes service history is obligatory too.