Busa's have to be one of the most stout, over built bikes out there. You can do *anything* to this bike. I tour on my bike, and do track days on it as well. Palomar Mtn, Sunrise Hwy, Banner, Montezuma Grade, Telegraph Canyon Rd, are all in my backyard of San Diego and I've been playing on those for over 15 years.
You have a LOT more performance, merchandise, options and help available for the Busa. You can make it anything you want. I myself have made it into a canyon racer/track day bike/tour bike/drag bike all in one, with very very minor mod adjustments for each (taking mirrors off, lowering the bike for drag racing, etc...)
The new 08 Busa is here. But even then, you can, as most all of us, build your bike to exactly what you want and be well more than happy with it for 10 plus years.