How much money to put in on this river?

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How much money should I be putting in on this river? Villain is 50/15/2. I haven't seen enough to comment on his postflop play.

Party Poker No-Limit Hold'em, $ Hero (6 max, 5 handed) converter

UTG ($308.53)
MP ($571.3)
Button ($795.75)
SB ($577.63)
Hero ($746)

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $3.
<font color="#666666">2 folds</font>, Button calls $6, SB (poster) completes, Hero checks.

Flop: ($18) Q[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, Button checks.

Turn: ($18) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $12</font>, Button calls $12, SB folds.

River: ($42) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $35</font>, <font color="#CC3333">Button raises to $125</font>, <font color="#CC3333">Hero raises to $350</font>, <font color="#CC3333">Button raises to $575</font>, Hero calls $225.

Final Pot: $1192