Is this tournament still going on? I think Bomberman is in a good position to win the whole thing. His CPU is fairly intelligent and only SDs when he prematurely fastfalls after up special. Jigglypuff's great too, but the Marth matchup is probably the worst for it. Fox has the most potential to be dangerous in my eyes, but he SDs a fair amount sometimes so I won't count on him winning.
I just finished doing a small CPU tournament for myself and got pretty interesting results. Saved replays of the top 8, which I should be uploading to Youtube soon.
http://challonge.com/jagssf2cpuI'm going to make my second one a little more public and with voting, so look out for that.