For sport/touring, no one ever mentions the most important (to me anyway) thing that can't be fixed by a higher windscreen, higher bars, better seat, etc. And that is vibration. The Busa has a mean vibration around 4,500. I would get the Blackbird. It's smooth as silk, quick, and comfortable. And for only $4K:
http://denver.craigslist.org/mcy/839913256.html. What a steal.