Paulie: You should be thankful the busa starts at 474lbs dry, otherwise you will probably flip it breaking it in! My old GSXR1100 was also 474 untill I lightened it up a little and lowered the gearing. It's a wheelie machine now!
The ZX-9 I didn't trust, the busa seems to be more solid, wide power band etc etc...
GET THE BUSA!