This one. Mid-1960s Cinelli SC. There is a slight springiness, a little extra liveliness, that is subtle but definitely there and makes for a great ride.

I have some other great bikes that are a true joy to ride (especially the Ron Cooper and the Eisentraut), but there is something extra special about this one. The Cinelli, the Cooper and the Eisentraut are all set up pretty much identically (Campy 10sp triple, Campy Record or Chorus hubs laced 3x to Open Pro rims with Conti 4000 tires, Nitto stem and noodle bar, Rolls saddle), so by far the biggest variable is the frame. Besides, it's way cool to think that maybe, just maybe, the guy who built frames for Fausto Coppi also built this one. (Absolutely no way to know, but it's possible.)

If I could only keep one, I would very sadly bid the others adieu and keep this Cinelli.