Eh, My best guesses:
15+ Something red face paint/blaze (depending on what setups are gotten in which game)
11-14 Gardy, no question about it. It is kind of flying under the radar right now, and my money is on it to win.
10- Well, I am going to say water, but one of the kids going to my league is using a blaze deck there, the list I gave him, and may do well (IF he puts atleast one of the quasas back in! like i said).
My moneys out, all 0.5 cents of it.