I'd like to find a 1920's Enfield, Triumph, or Brough Superior single. Not impossible to find in Europe, tougher here in the states. $10-20k unless it's something terrifyingly rare, so perfectly attainable and will only appreciate. Right now, the oldest bike I've ever owned is my '60 Super Cub. I've been a gearhead since just about birth, but the longer I'm into it, I get drawn towards older and older machinery. The end result of this is surely Steam Tractors.