Too risky?

[Requin]

He's rolexxx gangsta, I can't figure out his stats since I played HU with him before but I think he's like 25/20 or so. Decent regular, probably a solid winner but not great. Anyways I'm almost sure that IF he's bluffing the turn, he will continue the bluff on the river. So...

Party Poker
No Limit Holdem Ring game
Blinds: $5/$10
6 players
Converter

Stack sizes:
UTG: $930
UTG+1: $1033.75
CO: $1975.50
Button: $1187
SB: $1365.50
Hero: $2877

Pre-flop: (6 players) Hero is BB with 5[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]
UTG folds, UTG+1 calls, 2 folds, SB calls, Hero checks.

Flop: ($30) 8[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/club.gif[/img] (3 players)
SB checks, Hero checks, UTG+1 checks.

Turn: ($30) 6[img]/images/graemlins/heart.gif[/img] (3 players)
SB checks, <font color="#cc0000">Hero bets $24</font>, <font color="#cc0000">UTG+1 raises to $89</font>, SB folds, Hero calls.

River: ($208) J[img]/images/graemlins/club.gif[/img] (2 players)
Hero checks, <font color="#cc0000">UTG+1 bets $204</font>, <font color="#cc0000">Hero raises to $558.48</font>

Also anyone think I can fold out a straight here?