10/20 hand I botched (I think); what would you do?

[garyc8]

Pre-flop:
I limp UTG with A [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/club.gif[/img]. UTG+1 raises. 5 cold calls. BB calls. I call. 8 of us take flop.
Flop:
K [img]/images/graemlins/club.gif[/img],8 [img]/images/graemlins/club.gif[/img], 5 [img]/images/graemlins/heart.gif[/img]. BB checks, I check, UTG+1 bets, call, MP raise,1 fold, 2 LP cold calls, BB calls, I 3 bet. UTG +1 folds, all remaining players call.
Turn:
J [img]/images/graemlins/club.gif[/img]
The pre-flop raiser (now out of the hand) mutters, "no waiting". I take advantage of the table-talk and say just loud enuff to be heard, "If they've got it, they;ve got it." And bet. A couple of folds and the a raise from LP. I notice that BB(a LAG) was already leaning over the table with enuff chips in his hand to raise. He is clearly surprised by LP raise, and now announces a call.
The Question:
Three of us will take the river. Should I 3 bet now and step out on the river? Or call now and play to check raise the river? I think I chose incorrectly. Will post results later.

(Sorry if my narrative is hard to follow. This is my first post here> [img]/images/graemlins/cool.gif[/img])