Czad-You're right on the border between the 6.1 and the 6.2. I'd recommend the 6.2, I'm in the same place between the 6.2 and the 6.3 and I end up getting munsoned with the slower hull speed in the smaller size...
Le Mitch-The only kingpins out now are the icons, but originally the icon version came with attachment points for "volume pods" on the bow and stern and some slots for fins on the hull while the non-icon was just the basic boat. Now there is no provision for adding volume pods but the attachment for the fins is still present.