After reading all the comments I have to chime in because I own honda magna, ninja 650R and FZ6.
First of all, congratulation to "2000 Intruder" for the new FZ. You will love it! A few interesting points I would like to make:
First of all I used to have an intruder. I bought the bike because I like the look, and still does. But after a few months of owning it, I was disappointed at its performance. 800cc twins did not do much for me, specially when I tried to pass I needed to go from 65mph to 80 mph quickly to do it safely. When I twisted the throttle, it did not respond as I expected. To me this could be dangerous if I don't have much time to pass.
Second, reading other's comments it is interesting how, like me, they would consider SV650, honda 919, and then settled for FZ6. I did the exact same thing!
Thirdly, again similar to other's experience, to me FZ6 is very comfortable even with the stock seat. It may look aggressive stance, but once you sit on it, you feel upright riding position and your feet are not as much to the rear as on SV650, or even as on ninja 650R. Like some of you, on a cruiser I would have a sore back with forward pegs and lounch chair position. I think upright riding position as on standard bikes is more natural and good for your spine. Contrary to popular opinion, cruiser sitting position is not really comfortable, at leas not as comfortable as it appears.
I also like ninja 650R, it is quite comfortable for a long trip but I put FZ above it a bit. My next bike would be SV650, and if I put a handle bar riser it should be about as comfortable as the ninja. OK, I think I have said enough.