I vote for 16 Bit, I think he's hype and can be professional about it... I have no doubt it need not be said, but maybe just be careful about hometown bias on certain matches.
As for who else I don't know, Tom is usually good on commentary but at a recent major a match went ignored because he was too busy talking about his own beef with other players in the stream chat, so maybe he'd be better as a hype player at MLG.
I like DMS on the mic too, but sometimes it gets a little tiring hearing him go on about having money on whoever and betting etc.
I'm sure all those candidates would be extremely professional for MLG, so most of those concerns probably aren't warranted.