I put on a Renthal gold road-low handlebar and some gel hand grips. I'm 6'3" and felt the stock handlebars were too "sportbike" for me. The Rental's are perfect, they bring the grips back and are a bit wider. I did have to change the front brake lines but got a nice set Goodridge Shadow lines for the FZ8 that bolted right on. I also had to spin the throttle cables around so they run underneath the mastercylinder, but that was no biggie.
The bike rides soooo nice now and the 5k vibration is nearly gone. Also my mirrors are out wider so I get nearly no view of my arms now. I am so stoked with these upgrades.
I got my Danmoto XG-1 in the mail today but will be shipping it out for black ceramic finish soon. Also go a set of black shorty levers off of Ebay that I will be installing. Hope to add some mileage and get some pics up once the rain passes thru.