I think you should bet. You showed strength the whole time, so by checking here, some maniac might make a bet and you wouldn't know what it meant. Bet, so that opponents may belatedly show their strength, or so that others are less inclined to get cute.

I think you will lose the pot to mp3, but it's better to find out for sure by giving him the chance to make it two bets. if he RR and someone 3bets, you'll have better foundation to decide. But, if you check and the maniacs bet and RR, what do you do?

Enough times, these people have reduced standards because of the maniacs that you can bet for value. But then, maybe my experience with maniacs is different.