Summer Sidhe: Like being a wizard, but sexier. Given the "ultimate", we can safely assume that either Summer's goals are my goals or I am sufficiently powerful that I don't really worry about incurring Sponsor Debt any more. Summer is the court of love, light, life, and warmth. These are good things. I would be happy with these kinds of things defining the thematics of my endless existence.
Ultimate Werewolf: Fully sentient, at-will, in-control Loup Garou! Mythic everything, and there's a lot of cute Team Jacob types out there.
And of course...
Ruler of the Outer Gates: I have a very soft spot for pet shoggoths. It's hard to beat this one; you and the entities you command likely have access to all manner of strange and terrible reality-bending powers, and magic immunity seems like a big hit with the Outsider crowd. Also, tentacles. Being able to reshape yourself and reality as you please has a lot going for it. There are not nearly so many cute Team Cthulhu types out there, but they're keepers.