My father has a grizzzly 700, its a rat, the tranny feels laggy, like its always rvving faster than it moving.. The suspension is built for pulling an pushing... If you were trying to get a machine that has all the fun out of it, thats the one...
Not that its not a good machine, for work its one of the best, but for work/fun you will be dissapionted....
I have drove a ton a machines, probably most that are currently available..
Granted I have them strictly for fun {thats why I have a raptor} I think as a Busa owner you probably want something you can spin around once and a while, maybe lift up the front end ect..
Go for either the KFX700 or the suzuki king quad 700efi Stay away from the Honda rincon and yamaha grizzly, You will find them heavy and clumsey for having fun.. Which it sounds like FUN is hat you are looking for because your second chioce is the 2wd 400 {I used to have one pretty cool machine
But good luck, I cant stand riding any of the 4 wd machines for too long, I need that 2wd whipping around feeling, Like the YFZ450- or Raptor