Ooh! I know you said you already had a Keith--but what about this idea: Allison Janey. Boom! You're welcome.

That age-stuff is tricky. I was trying to think of indie-ish kids at the cusp of high school and college, so I was looking at stuff like Juno, Whip It, and whatnot. But I can totally see how that would end up too old. I just have no idea who is high school age these days. The Disney kids always manage to creep me out (though I do love Selena Gomez--she does those cute Borden commercials).