Between my son and myself, we've got:

flat bars
riser bars
dove bars (upright)
bullhorns
track bars
ergo drops
non-ergo drops

We're converting his flat bar fixie back to drops. I went from upright bars back to drops on one of my road bikes. Drops seems to be the most versatile. The (nitto) dove bars are pretty cool for an upright position, especially paired with a B67.