Honda 900 Hornet (919). Bought it as I needed something reasonably quick and more upright than my VTR1000. A very worthy bike, but god it was dull. Only four I've ever had and on that basis I wouldn't have another.
Ducati Monster S4r. Very fast, good handling but not different enough from the other Dukes I had at the time. I enjoyed riding it but just didn't look forward to riding it. Only kept it 2 months and then sold it for a 996. Now that was a different story altogether....