Originally Posted by
achoo
Cassettes, chains, and cables are wear items. DuraAce shifters do not demand a DuraAce cassette or chain. A $20 ten-speed Tiagra cassette works just as well as a DuraAce cassette.
$400 for DuraAce 7800 is a steal. And you don't have to replace your front derailleur, nor would you be likely to notice any difference if you did anyway.