I don't qualify for 50+ yet, but I can see it from here. I'd keep my penny-farthling:
Joking aside, clear and easy choice is the 2009 Kona Dew Drop:
This bike is fun, flexible, durable, and just awesome. Does it all for me, daily-commuter, centuries, gravel centuries, pulls the BOB home from the grocery store, summer, winter, what ever you throw at it, it's up to it.
My other bikes (listed over there << ) include a nice city bike (Globe Daily); SS MTB/winter-commuter (Marin Nail Trail) and the pure road bike (Felt Z85). I truly enjoy all of these bikes, but if I had to live with one bike every day, the Kona is the winner without any question!