Sometimes you can't be afraid to go to the felt. What you know about a player helps here determining his range of hands. You may want to make a considerable raise on the flop, giving you good information, to avoid this decision. You can check behind on the turn, but you will probably be right in calling a river bet because he could easily be bluffing. How many hands can a Q72 flop help? AA,KK,AQ,KQ,QQ,JJ,TT and the last two will be tough to play if you make a play at the pot on the flop or on the turn. Personally, I'd respect the ace and fold the flop. I suck playing middle pairs but I'd probably push the turn in your situation