go for overcalls or raise?

[slik]

Don't have significant stats on these players, but I had a strong feeling that button would bet the river here, giving me the chance to checkraise. when should I donk bet the river here? when should i go for the checkraise? and when should I let button bet and just smooth call? What do I do here?

PokerStars 1/2 Hold'em (6 handed) converter

Preflop: Hero is SB with 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, CO calls, Button calls, Hero completes, BB checks.

Flop: (5 SB) 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
Hero checks, BB checks, <font color="#CC3333">UTG bets</font>, CO folds, Button calls, Hero calls, BB calls.

Turn: (4.50 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, BB checks, UTG checks, <font color="#CC3333">Button bets</font>, Hero calls, BB calls, UTG calls.

River: (8.50 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
Hero ?