Well, I'm 6-4 and bigger than you guys.
For me, the C5 is most comfortable to ride. You really need the factory passenger seat so you can scoot back a tad and lean on it. Big improvement.
I really thought the G was going to be "my bike" but the tall gear and springy seat of the C makes it just plush. You just float along.
For a G to be mine, long term, i would fit the AM26 Avons like the C has, put the larger countershaft on, and maybe have Corbin do a bit less stepped seat.
Like any new bike, adjust the shifter to fit your feet, adjust the levers and mirrors.
Power? a non-issue. It gets my big butt up to 65-70 briskly without dinging the rev limiter. Just rev her a bit and keep shifting.
If you don't mind driving to Fresno, we have a demo C and G for you to try out. We also have our remaining 2011 C5's discounted. Plus, our 2011 Green G5 demo is discounted as well.
Pictured are three big ones! Kevin Mahoney, Me, and Olhogrider here at our open house.