hypothetical 5/10 overcard, nice turn, what do u do now, hand...quizz

[oreogod]

5/10 game. Players are decent, and average to good postflop.

You raise from middle position with the A [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/club.gif[/img] after an early player limps. Two middle players cold call, the early limper calls the raise. 4 players to the flop, $47 in the pot.

Flop (4.7sbs): 9 [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/spade.gif[/img] (4 players)

Early limper checks, you BET, MP calls. (the EP and other MP fold)

Turn(5.7 BBs):A [img]/images/graemlins/spade.gif[/img] (2 players.)

Giving u top pair, top kicker. You BET, MP RAISES (8.7 BBs).

What do u do?

1.MP is a solid player.
2.No reads, but u know the game is tight/aggresive.
2.What is your action if player is a little loose.