Lay the hammer down, or wait?

[JasonP530]

1/2 200 NL. I have everyone covered. Original raiser has 130. I have 77 in the Hijack.

EP raises to $7. 2 callers, I call, button calls and BB calls.

Flop is K97 and no suits. EP raiser fires out 40. Everyone folds to me, and I move in.

My logic was that if he had a hand strong enough to bet into 5 people, then he could probably withstand an all in of the pot. Is this a better line than just calling, hoping he bets the turn, and depending on how much, either calling or raising then? Perhaps(unlikely), he fires again with nothing?