I am a complete tool hore. My wife just spent $30 to ship a ten dollar tool from Europe for Valentines. For bike parts it would be a toss between hubs. Their shapes can be beautiful(I even have a pair of Miallards heliocentrics that I turned into candle holders for an engagement present) And Saddles, old leather saddles. Like Fixer I like the leather goods. Saddles, and bags even non bike bags and luggage are very cool.