Ahi is a great fish to cook with, and is one of my favorites because it's so versatile, and is a great canvas for carrying different flavors, beit Asian, Mediterranean, Latin, etc. I prefer it either raw in some type of cru type dish, or seared rare, but no more than medium rare. Fresh Ahi cooked more than medium rare is garbage. You lose the very essence of the fish if you cook it farther than that. If you cook it past medium, you may as well just order cardboard.
"Boldness has genius, power, and magic in it."
Johann Wolfgang Von Goethe