lestro

That's amazing :) Congratulations. Run good and run it once.

Theory would pretty much never offer any reasonable answer to such a vague question.

Juan,
how could he be leading 6xdd if you're holding 7d6d..
I think 6x would be a dumb lead, no playability after he gets called (assuming he has no flush draws/backdoors). There's only one combo of T6s on the turn.

You didn't consider raising the flop?
First, he can't 3bet you there (besides KdQd, which is probably discounted due to preflop action, and you block 66, JT would be in a terrible shape here if all money went it). By calling, you (might, there's still BTN) see the turn cheaper, but if you hit your flush, it's not certain you would get paid off, and there are still some rio.

By raising the flop, not only you fold out a lot of hands right away, you have great equity vs. his continuing range, and you will have a lot of fold equity when you continue betting on the turn. You push button off a lot of his hands as well, and you put BB in a pretty tough spot.
I make it $95-105 and go from there.