NLT $11.50 River Straight

[Innocent Kitty]

I'm having trouble lately knowing if I should try to maximize value out of my semi-big hands on scary boards. He's shown me some bluffs when I folded on previous hands before the river, and seems somewhat solid in general. The river is at least a call because of the odds he's giving me. My question is, should I be pushing this hand over his raise on the river?

PokerStars Tournament, Big Blind is t20 (2 handed) Converter on pregopoker.com

Button (t1510)
Hero (t1490)

Preflop: Hero is in BB with 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img]
Button calls t10, Hero checks

Flop: (t40) 4[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] (2 players)
Hero checks, <font color="red">Button bets t20</font>, <font color="red">Hero raises to t80</font>, Button calls t60

Turn: (t200) 7[img]/images/graemlins/club.gif[/img] (2 players)
<font color="red">Hero bets t120</font>, Button calls t120

River: (t440) 6[img]/images/graemlins/club.gif[/img] (2 players)
<font color="red">Hero bets t240</font>, <font color="red">Button raises to t480</font>, Hero ...