Disclosure: no mountain bike
Commuter: 12 year old GT Outpost trail. Pictures somewhere here on a powdercoat thread. Why? Cause it fits and is a hoot to ride.
Mixte: '70's Motobecane converted to a freewheel. Why? Because it makes people smile just to see it.
Road: custom Mondonico Futura Legero, why? Because it fits me like a pair of jeans, I'm 5' nuthin' so went custom. And it's beeyooteeful and rides as good as it looks. I'll never look at another bike. :cool:
Also have a '80's lugged steel Giant RS940 which is being built up as one of Knott's bikes. I have to take her word for it that it's great since I can't even get a leg over the top tube ;)