2/4 - 3bet pot, push him off or showdown?

[JrJordan]

Villain is bufo523, running 20/18 for the session over a decent sample. He's 3-bet me a few times because I've got a fairly preflop aggro image and have folded for the most part.

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($673.60)
BB ($474)
UTG ($412.65)
MP ($217.20)
CO ($485)
Hero ($394)

Preflop: Hero is Button with 7[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls $4, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $20</font>, <font color="#CC3333">SB raises to $64</font>, <font color="#666666">1 fold</font>, MP folds, Hero calls $44.

Flop: ($136) 6[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $90</font>, Hero calls $90.

Turn: ($316) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: ($316) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero...