I have ridden the RC in traffic, and would have to vote Busa. Although I might be biased.
The Rc is awesome if you are riding twisties or the track.
If you want a good, cheap vtwin honda that is good for commuting as well as sport touring, get the VTR1000F. 90% of the performance of the RC, cheaper, and more bearable for commuting.
fuck it, get the Bus!
retarded fast, comfy and decent handling