Ouch, this is a real toughie. I think you are ahead more often than not, I'd rather call than be knocked down to roughly 200K with those blinds and antes. Sure, you'd still be in the game, but you are probably ahead of superaggro's range right now, and winning this pot will make your chip count almost 800K.

Fold, 200K, Call and win, 800K, call and lose, 6th place...

I'm going for first, I call here.