I went Crusader, Midgardsomrmr, Phoenix, and Ark.

I have a serious soft spot for Crusader, and Midgardsormr is actually my favorite earth elemental summon in the series. Phoenix is a no-brainer, especially since it's usually attached to some of the best story moments in the series. Ark is another one I have a soft spot for, though like Crusader, I have a feeling it's going to lose this round.