I suspect a lot of people here are just voting for Khuutra because his recent, mega-length quote riposte to ZenFoldor is the first example of an intense debate that comes to mind. He's a good poster, but I don't think there was any particularly special or useful about that post.
Starcraft's rhetoric is strong enough, but I don't rate him highly (cf. MakingMusic destroying him about GG in the 'Halo Wars & KZ2 legs' thread).
Personally, I'd take MontanaHatchet as my favourite. That said, might as well take most of the staff because they're all excellent (Benga, Bod, Twest, Fishy, Nazna, Onyx, etc).
Of non-staff members, I'd take DMJ. When you ignore all the sycophantic fuss over him from some of the VGC community, there's a veteran of a debater right there. Rol and Zucas are extremely shrewd, too.
