I have had pre-STI 9 spd. Ultegra on one of my bikes for about four years and wish to upgrade shifters and drivetrain. I noticed today on the "DA comparison site" that many 7700 parts sources are showing the "NA" notation. Does it now make sense to go 10 spd. even though 9 spd. is perfectly acceptible for my riding? Is a present 7700 upgrade a moribund direction? What makes the most sense?