If I personally was playing I would bet this flop(like you did) You don't have much to fear at this point with outs everywhere and middle pair to back it up (not saying if I only had this middle pair with no draw that i would take the same course of action) I would then push the turn as previously suggested by others because it could force people off a lot of hands that could beat you. Should they have the balls to call you, you still have outs to win the river.
Thats my point of view