If you had to worship one god of the Northern pantheon....

[jidasfire]

Even his cool name notwithstanding, Vafthrundir seems like a pretty awesome deity with a lot of great knowledge. From what I recall in the myths, he was also one of the few giants with a brain, who matched wits pretty well with Odin himself. And his high priest has a stylish look as well. Second places goes to Tyr, whose priest has pretty boss armor.