I have the RF-1000, RF-1100, and RF-1200 as well as a GT-AIR.
For the FZ8 I like the RF-1000 best. It's light, very comfortable, and handles the airflow quite well.
The RF-1100 is a fairly close second, but it's a bit heavier with a slightly different fit. For longer rides or touring the 1100 would be my pick, for day rides and around town I'd go for the 1000. However the 1000 is no longer made and it's not really an option any more. I happen to have one that was in the box and in storage for a while so it's serviceable.
The RF-1200 did not live up to the hype. The first one I got had a seal come loose, but of course Cycle Gear swapped it out right away, no worries, Shoei has an excellent warranty. The second one was perfect, no issues.
But, the 1200 is quite noisy and breezy. It's light, about the same weight as the 1000, but fits differently, not quite as firmly on the head. I ended up getting the 43mm cheekpads which firm it right up.
Of the 1100 and 1200, if you're doing a lot of longer rides, I'd go with the 1100; it's got more features, like the positive lock for both visor cracked open for venting, and visor locked down, it's got six vents on top, and just a lot of features that make it great all-day helmet.
If your rides are shorter and you want a lighter helmet, go with the 1200.
The GT-AIR is a touring helmet, plain and simple. It's costly and the aerodynamics are superbly tuned, but it is heavy, noticeably so, because of the thick shell needed to accommodate the inner dark smoke visor. That's sort of a cool feature if you don't want to have to worry about sunglasses or swapping visors, but you have to get used to the inner visor (which still allows glare from the instruments to come through unfiltered) and you have to keep it wiped down using a soft glasses-cleaning cloth. It is a neat feature, though, especially for those who ride with prescription glasses and don't want to have to fuss with multiple pairs of glasses for dark and bright conditions.
The GT-AIR is really a flagship helmet, build quality is superb as is quietness and ventilation. The RF-1200 is noticeably less sophisticated; the RF-1100 is closer in overall quality and functionality to the GT-AIR.
Hope this helps.
