A $30-$60 game. You are in early position holding the

. A player limps in ahead of you. You limp. A middle player, the button, and the small blind limp. There is $180 in the pot and six players. The flop is:

:

, giving you top pair, decent kicker. Both blinds and the early limper check. You bet. The button and the big blind call. There is $270 in the pot and three players. The turn is the

. The big blind now bets. You just call. The button calls. There is $450 in the pot. The river is the

. The big blind now checks. What do you do?
