Friday and Saturday are pretty open for me, I've seen a lot of the bigger names in previous years and think I'm going to let my mom lead the way (she's flying out from Austin and has been researching for weeks). Sunday, however, is one enormous conflict for me.
Realistically Sunday will look like: Welch, Kane, & Kaplin > Nicki Bluhm > Warren Hood Band/(Billy Bragg) > Trampled by Turtles/(Time Jumpers) > String Cheese Incident
EDIT: And, Tom, why have you never made it to this festival? Aside from absurdly chatty crowds, this festival is right in your wheelhouse.