I missed the first Wi-Fi night involving Mario Kart which is why I'd vote for it this time around.
Plus, I don't like SSBBrawl so you don't have to worry about another vote for that every month.
I'd definitely join in on a Bomberman Blast party, it's an enjoyable game and it supports eight players so lots of people can join in.
I wonder if it'd be too frequent to have a designated W-Fi night every week. There could be a night for SSBBrawl, a night for Mario Kart Wii, and the remaining two nights could be any obscure game which strikes the mood of the participants. I don't know if titles like BWii and Mario Strikers Charged will ever win in a monthly event.