10/20 PP Nuts on the river...help on maximum extraction?

[sxz18]

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

BB ($4842)
Hero ($2257)

Preflop: Hero is MP3 with T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $10.
<font color="#666666">3 folds</font>, MP2 calls $20, Hero calls $20, CO calls $20, <font color="#666666">1 fold</font>, SB (poster) completes, BB checks.

Flop: ($100) J[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, MP2 checks, Hero checks, CO checks.

Turn: ($100) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">BB bets $97</font>, MP2 folds, Hero calls $97, CO folds, SB folds.

River: ($294) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $250</font>, Hero??

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A few things to consider...Villian is the most LAG player at the table and I JUST stacked him at another table with QQ when he decided to bluff with four high. He is definetely making the table richer. His turn bet was pot size and although an open end straight draw is usually a folding hand on the turn, I felt certain that if I hit my draw, I would be able to extract massive chips from him, hence I called getting 2:1 odds.

Given all this information and the nuts on the river, what's your move? Villian is LAG enough that I'm almost certain he will call a raise to $750 because he does not like to fold to raises. However, the question is should I push on the river, hoping Villian will be LAGGY enough to stack me up or should I be content and raise to $750-$900?

EDIT: I realize the river action is very read dependent but hopefully this post will generate a lot of responses.