One of the most important functions of your first bike is to help you figure out what you want in your next bike. Acquire ANY bike and ride it where ever and how ever appeals to you at the time. Try to do something different every day. Every time that you ride, make a mental list of the things that appeal to you and the things that you don't like so much.
Only now can you be properly prepared to shop for your "real" bike.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.