I sold at $17 and don't regret it (bought at $14-15 earlier that week). But my typical use is of bitcoin is a as barter currency (where the other party only cares about dollar value), I'm no speculator.
Similar story here. Bought and mined about ~100BTC when it was around 5$/BTC and sold @ 10-15. I converted some to physical coins from https://www.casascius.com/ and keep those on my desk. I guess I should put them somewhere less obvious. Haha