Value bet flushy river w/set?

[Duuzend]

Villain just sat down about an orbit ago, no history, total unknown to me.. What's your river line? Anything about the rest of the hand?

Everest Poker Limit Hold'em, $0.50/$1 (HH Converter by Kreatief)

MP3 ($95.50) (Hero)
CO ($114.30)
Button ($97.80)
SB ($224.00)
BB ($129.20)
MP2 ($87.60)

Preflop: Hero is MP3 with 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img]
<font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises to $3.50</font>, CO calls, <font color="#666666">1 folds</font>, SB calls, <font color="#666666">1 folds</font>,

Flop: 7[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img] ( 11.5BB )
SB checks, <font color="#CC3333">Hero bets $9</font>, CO calls, <font color="#666666">1 folds</font>,

Turn: A[img]/images/graemlins/spade.gif[/img] ( 29.5BB )
<font color="#CC3333">Hero bets $23</font>, CO calls,

River: Q[img]/images/graemlins/diamond.gif[/img] ( 75.5BB )
Hero?