My experience with some of the listed boards (keep in mind I ride normal widths so YMMV):
Donek: Honestly that would be my choice for a wide, stiff board. You know Sean. You know what he offers, nothing more to add.
Korua: I was really disappointed with the Korua (can't remember which one I rode). The reviews were awesome but the board didn't deliver IMHO. It could have been just me.
Gentemstick (Manta Ray?): MEH. It was fine but that was just it. They are really well made though.
I am really curious about the Soul Pitch Wing. Would love to try it... Looks cool!