Since it is a secondary or sporty weekend vehicle, choose for the SLK, as it is widely regarded as a quintessential sporty automobile.
Mileage - aim to remain under 100,000, a psychological threshold.
A vehicle with minimal ownership and a full service history, particularly through Mercedes-Benz or independent services, is preferred.
Has been serviced punctually, possesses numerous receipts, and is, in my opinion, invaluable.
The tires can frequently reveal crucial information; for instance, having all four tires of the same reputable brand is advisable. The owner will invest a modest sum in his/her vehicle. The general state is another
Purchasing from a private seller generally provides greater insight into the vehicle's maintenance and may reveal a legitimate rationale for its selling.
If desired, have the vehicle inspected upon purchasing privately.
Best of luck