I bought a W108 (1973 280 SE 4.5) last year. It has become my favorite car. I put 5000 miles on it in the last 12 months, including a 2200 mile, eight day roundtrip from MA to SC. I am amazed at how really driveable it remains almost 40 years later. It gets around 13 mpg and has been relatively trouble free. Parts seem to be widely available. As is always recommended, but the best one you can afford and have a pre-purchase inspection done.