so much as the best maintained, best inspection by a Porsche expert via a PPI. Owned 2, both great experiences. The pre-purchase inspection on the second told me what I needed to spend and it wasn't cheap to get it completely into the condition I wanted it to be for confidence. 90K service (most comprehensive), alignment, tires, brakes. Everything proactive I could think of by a shop that was a Porsche specializing shop that preped cars for racing. 6 years later it had needed little beyond another set of tires, brake fluid flush, battery, filters and oil changes. Oops, an O2 sensor. The expert found things I wouldn't have and I had a Previous Boxster.
Find a well recommended mechanic first and they can frequently lead you to a car they know the history and condition of.
Buy good and you increase your chances of being happy.
Look for a car owned by a fanatic. Tell from their enthusiasm in describing the car. Know the reason they are selling and verify the reason. Then PPI. Trust but verify.