I like Close your eyes, though Shane (vocalist) is leaving or has just left. Both them and Underoath are Christian bands, Underoath are a little less melodic for my liking.
Never seen them live but would guess they put on a good show
mm I didn't know Close your eyes before knowing about this festival, but I checked their songs and I like their style. I already knew the other ones... I know that Protest the hero and We came as roman are bands with really good musicians, I don't know too much about Underoath.