NL100SH - str8 in unraised pot

[skibbel]

Villian 22/16/3 ~100 hands

SB ($25.40)
Hero ($93.80)
UTG ($108.80)
MP ($52.15)
Button ($125.70)

Preflop: Hero is BB with 6[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls $1, Button calls $1, SB completes, Hero checks.

Flop: ($4) 5[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, MP checks, <font color="#CC3333">Button bets $3</font>, SB folds, Hero calls $3, MP folds.

Turn: ($10) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $7</font>, <font color="#CC3333">Hero raises to $23</font>, Button calls $16.

River: ($56) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ...?