[Bill C]

I like the 3-bet the flop, lead the turn line.

And I agree with QTip about putting some pressure on MP-1, who just keeps check-calling. Let him face two cold on the flop.
Your turn check sets up a nearly mandatory bet by villain, so when it comes I don't think you should be scared off by it. Things might look a little differently if you had been more aggressive earlier.
Given the realities of where you are in the hand, you should probably call. But since your hand is too good to fold, a raise here might also be good, and would give you some info, put some pressure on MP-1 and perhaps set up a free showdown.

Just my $.02 worth...
bill