If it has been used near the sea, have a carefull check for internal wing corrosion. 15 years ago, a group of us nearly bought a very well maintained C172, always hangared during its time in Scotland. We knew its recent history. Our engineer, who had maintained it, found extensive corrosion, not detected by normal maintainance, which cost its owner a lot to rectify. It had started life in the US midwest, but had been used on Scottish islands for many years. It had not been corrosion proofed, I understood.