str8 on 4 to a str8 board and 3 to a flush

[recallme]

Villain is unknown, just 2 orbits with him

Poker Stars
No Limit Holdem Ring game
Blinds: $10/$20
6 players
Converter

Stack sizes:
UTG: $2028
UTG+1: $3631
CO: $1865.50
Button: $1990
Hero: $2097
BB: $3076

Pre-flop: (6 players) Hero is SB with Q[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img]
4 folds, <font color="#cc0000">Hero raises to $70</font>, BB calls.

Flop: J[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img] ($140, 2 players)
<font color="#cc0000">Hero bets $110</font>, BB calls.

Turn: T[img]/images/graemlins/club.gif[/img] ($360, 2 players)
<font color="#cc0000">Hero bets $230</font>, BB calls.

River: K[img]/images/graemlins/spade.gif[/img] ($820, 2 players)

I am so lost on the river. I think i miss lots of value by checking.
But bet/calling doesn`t feal good either.
What you think of bet 600/folding ?