You're forgetting Rousseau . I was drawing a blank on "Sarah" too and had to look up who she even was. She is definitely up there but she's doesn't really qualify as a cast member to me since she had such limited flashback appearances (at least so far - you never know who might show up on the island next...).
Since we're burning time waiting for tonight's ep, here's my sexist and objectifying list
9) Anna Lucia
I am with IAM4UK on waiting to rank Parachute Girl/Naomi since we really don't know how she'll be on the show yet .
You must not be listening to the podcasts... producers have confirmed that the seventh season will be the zombie season where all the dead losties and others will come back to "life". Hope that's not a spoiler...