turn a set (PP 3/6 NL)

[baiter]

PP NL 600...

I have about ~$700, Villain has ~$1000.

limp with 7 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/heart.gif[/img] in MP...folded to BB who raises to $20. Seems like a solid but aggresive player. I recently sat down, so don't know what my image is. I call.

Flop is 4 [img]/images/graemlins/heart.gif[/img]A [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/diamond.gif[/img] rainbow, pot is ~$43.

Villain checks, I bet ~$25, he thinks and calls. Pot is ~$93.

Turn is another 7 [img]/images/graemlins/club.gif[/img]. Villain checks again, I bet ~$70, Villain calls. At this point I put him on AQ or AJ, maybe AK, thinking his ace is good (as I would have probably raised preflop with AK). Pot is ~$233.

River is a J [img]/images/graemlins/spade.gif[/img]. He checks again, I bet $100, he pushes all-in.

What's my move?? (Results to follow)