I agree with what Seajay said in that the main difference seems to be in the ISOZONE thing that is there to soften the ride for the aluminum frame. I saw the 2010 7.6 FX WSD at the store and I agree the color scheme was OK, but didn't thrill me. The black and gold on the 2009 7.5 FX is very puuuurdy!

Have you considered the men's versions of the 7.5 FX and 7.6 FX just as a comparison?

Ciao