The busa is classified as a sport tourer, not sure how much, if any that will affect insurance though.
As far as a starter bike, man i know you are prob tired of hearing this, but hear goes anyway. The busa is not a good starter bike,1 because of weight, and beacause of power, even ifyou are the most sensible guy in the world, and you be very very carefull, you still lack the experience neede to control a situation on a bike with that much power.
I have been riding sport bikes for about 12 yrs now, and my gsxr 1000 still on a weekly bases puts me in a situation,that without the experience i have built up over the yrs, could, and prob would hurt me very bad.
I reall believe that a guy who is sensible, and as big in size as you say you are, would be ok on a 600 to start, even though most would disagree.
But not a busa, or 1000, or zx12,etc.