Tough one! Pains me but I had to give the axe to Houses. Love TSRTS and No Quarter but pound for pound it's just not one of my favorite Zep albums. It sort of feels like an intermediary album between their spit-fire early days and the epic salvos of their latter days. Presence isn't as even of an album as HotH but it's a more 'important' Zep album to me for representing a unique version of the band. Which of course could also be said of ITTOD but I didn't necessarily like that version of the band, so...