Flush draw with lots of flop action

Table has been pretty LAG. Not sure if I should have 3-bet the turn or raised the river.

PokerStars 1/2 Hold'em (10 handed) converter

Preflop: Hero is MP1 with J[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#666666">1 fold</font>, MP3 calls, CO calls, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (7 SB) 9[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(7 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, UTG calls, <font color="#CC3333">UTG+1 raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP3 calls, CO folds, SB calls, BB folds, UTG calls, UTG+1 calls.

Turn: (11.50 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, UTG checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, MP3 calls, <font color="#CC3333">SB raises</font>, UTG folds, UTG+1 calls, Hero calls, MP3 folds.

River: (18.50 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, UTG+1 calls, Hero calls.

Final Pot: 21.50 BB