I've sat on all 3.....couldn't tell you much except that the Busa sits the lowest of the 3 I think. The ZZR1200 is bigger but like the Busa.....you'd be nuts to get one of those....HUGE power. Get the ZZR600 or better yet an SV650s.....both have enough power to make a newbie crap his pants.Ive been lookin at the ZZR600, its a nice lookin machine, I have only sat on the ZZR1200, kawi web site says the 600 has a higher seat height, anyone sat on all three, (bus/1200/600) for a comparison? the ZZR is also much less expensive, always good when starting out.