1972 BMW R75/5. I paid $2200 for it, about the same price as a Harley Davidson XLCH or a VW Beetle. Over the next 25 years or so, I put 197,000 miles on it without major repair. I set the valves, changed the oil, and replaced tires, mufflers and fork seals. I rode it to work, toured on it, and garnered trophies in vintage motocross and trials.
The engine and drivetrain were so flexible I could move off from a dead stop in top gear, and run it all the way up to a top speed in the neighborhood of 110 mph. Far and away the best motorcycle of its day, and the best $2200 I ever spent.