Semi-interesting river decision with AQ... (5/10 6max)

[AZK]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) pokerhand.org hand converter

MP ($508.50)
Button ($2183.75)
SB ($385)
BB ($825.56)
Hero ($2563.50)

Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $5.
<font color="#CC3333">Hero raises to $40</font>, <font color="#666666">1 fold</font>, Button calls $40, <font color="#666666">2 folds</font>.

Flop: ($95) A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $60</font>, <font color="#CC3333">Button raises to $155</font>, Hero calls $95.

Turn: ($405) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

River: ($405) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Final Pot: $405


A fellow 2+2er advocating betting this river, but I'm not sure if I totally agree. What do you guys think?