siku, nut, ticux, grey, borgpunx, andthefish, MANtrain, werd, Iceshadow and Tabaluca are the top group in terms of skill at aikido.
I don't have a fucking clue who's THE best, but it's certainly one of them.
Everyone in that group would be able to win a 1mill wager in aikido against anyone not in that group without breaking a sweat as far as I know, though.