I'm nasty at SSB on n64 and melee on gamecube. Most certainly going to be entering this tournament. I predict an easy round 1 win for me :-D
I will probably go with a classic GC controller for familiarity and play with Mario as my character, Ness, is not in Brawl. Plus Mario is always well balanced and should be an easy character to learn to be good with fairly quickly since this all takes place on the night of the launch and I will have virtually no practice time.