150,000 km is substantial, thus the first inquiry should be on the annual distance you want to cover.
If equipped with magnetic ride shocks, they should be inspected for oil leakage. The AC compressor is a potential vulnerability, thus ensure that the AC is operational. It is my observation that costs in the USA are rather elevated compared to those in Europe. Given the considerable mileage, a value between 60,000 and 70,000 euros is fair.