My flush got CR'd on the river by KMoneyK

[Irish Mafia]

Villain is KMoneyK - he runs at 23/20/3.5. He's aggro, tricky and a big winner. We have some history: getting it in light pf occassionally, and pulling moves on each other. Whats the optimal line on the river... and give how I put out a tiny bet, do you have to call? Do you prefer a bigger river bet?

Full Tilt Poker, $5/$10 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

BB: $1,504.50
UTG: $1,000
CO: $1,558.50
Hero (BTN): $1,261
SB: $1,035

Pre-Flop: 5[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img] dealt to Hero (BTN)
3 folds, <font color="red">Hero raises to $30</font>, SB calls $20

Flop: ($60) K[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $40</font>, SB calls $40

Turn: ($140) A[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $115</font>, SB calls $115

River: ($370) A[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $100</font>, <font color="red">SB raises to $500</font>, Hero [img]/images/graemlins/confused.gif[/img]