I'd have to go with wisdom as well. Power has never appealed to me, and I wouldn't want to have any kind of leadership position. Power would go to waste on me. Courage seems... it may be offensive, but useless. Courage is nothing but not having the foresight to think through the consequences of your actions before doing them. Or completely ignoring the consequences. If Link were Courage Incarnate and were not controlled by the player, he would most likely die on the first day on the job out of pure recklessness. Courage = reckless stupidity and restlessness.
Wisdom has its drawbacks, too. I mean, you can't DO much with wisdom unless you have an accomplice. Which is why the Triforce is designed the way it is. Three equal parts to a greater whole. However, wisdom appeals to me in that I wish I knew more than I do. I wish I could know what's ethically and truthfully correct in the world. I wish I knew the past, the future, and what to do in the present. It's very appealing to me, and that seems to be the general consensus so far here. XD