2004 BMW R1200C
I have to pick only ONE bike? I've got 17 of them! (well, technically 14 different ones, I have two pair of three of them, his and hers you'd say).
Why so many? Because there isn't ONE perfect bike for me. I do lots of different types of riding and one bike does not fit all. Can't expect my R1200C to take me off onto a rocky, pitted Forest Service dirt road, now can I? And my little Honda CRF230L can't be expected to maintain, much less reach, 75 mph on the freeway. Bikes for commuting, bikes for traveling, bikes for the dirt, bikes because they are unique and bikes just because.
There are sooo many neat bikes out there. Having only one bike would be like having only one pair of shoes. Besides, my 'garage' is bigger than my house. what better way to fill it up? :-)