Well, I finally opted for the 7.2 over the 7.3 - didn't figure I would notice the "upgrades". Used the $120 I saved to buy accessories (lights, computer, water bottle, shorts, cleaning stuff, etc). Love the bike, esp the black matte finish!
I agree with Mac - see no need to go any higher than the 7.3 FX. In fact my LBS doesn't even stock the 7.4 and up............