I just have one, and for that matter, it's a mountain bike. Rocky Mountain Fusion from 1993 or so, with Rock Shox front forks. I have several miles of gravel to ride on, in addition to more of pavement, no matter which way I go. I sometimes wonder if Rocky Mountain had something like a hybrid in mind when they made this bike though, as it has lugs for fenders and stuff. It was given to me a few years ago.
If I can prove to myself that I'm serious about bicycle commuting I may get a new bike later and keep this one for a backup, but only if I can find one I like better. And what ever I get will have to be good on gravel.