Rich - I think you're really going to like your new FX...whichever FX you choose!...i went with the 7.4 because my legs aren't the strongest and i'm used to 24 gears...so i really like the 27 gear setup on the 7.4!...plus, the 7.4 tires are a little bit wider for a bit smoother ride...
You're probably a little more athletic than me & should love the 7.6!