OP: Any bike of any era? Wheel building? Shimano components? Campy components? Are finances of any concern? The list could get quite long! I've never gotten beyond 9 speed of the Shimano flight deck/dual pivot/octalink era (circa 2000). There have been many "improvements" since then that often have special tools. I'd suggest looking at Park or Ebay or Amazon for a general tool kit and buy specialized tools as you need.