This is tough because there is such a huge difference between a GSXR1000 and a Busa, but I would try to sway you toward a first gen Busa. To me, it's the perfect all-around bike. The LSR and drag racing is a given, but people don't give it enough credit in the track/canyons/touring catagory.
I've blown by 600's on the outside during track days on my Busa (on touring tires), I've put in 500+ mile days without any fatigue and it's all So. Cal canyons, and it gets ~45-50 mpg.
FYI - I picked up my mint 2000 Busa with 4,400 (not a typo) miles for $5,500 last year. In comparison, I have yet to find a decent 600 for less than that let alone a 1000. The problem is, all the squids and new riders go for the sport bikes, especially 600 and 1000's because they are cool, plus they're a little intimidated by the Busa. That will probably change in the next few years as more younger people (like myself) can afford them now.
Get a Busa, you won't regret it.