Blue Oval,
I had a 600 prior to my 1000 & it was a great bike, but, you had to wring its neck to go, like riding a 125 2 stroke, and it would go very quickly (too quickly) which can get you in trouble fast with the law man. I was debating on a 750 or a 1000 also thinking the 1000 will be way to much for my needs but friends advised me to invest in the 1000, & I am glad I did. The 1000 is SO much easier to ride then the 600 as it has alot of torque & does not need to be revved to go. I can leave my 25 MPH neighborhood in 5th gear @ 25 MPH & the bike is content. A comparison I would make between the two is 1000=KX500 & a 600=KX125, both are plenty fast & both will hurt you if you are not responsible, it is just easier to ride the 1000 as long as you respect what it can do.
DoldGuy