($10) Do you always bet KK here?

Is this too weak? Are you always leading out this flop with a bet? And if you got a caller, is it check-fold after that? CO got his chips from an AA hand, no other reads.

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (9 handed) converter

BB (t650)
UTG (t740)
Hero (t790)
MP1 (t625)
MP2 (t775)
MP3 (t770)
CO (t1910)
Button (t1030)
SB (t710)

Preflop: Hero is UTG+1 with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t60</font>, MP1 calls t60, <font color="#666666">2 folds</font>, CO calls t60, <font color="#666666">2 folds</font>, BB calls t45.

Flop: (t247.50) 6[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, Hero checks, <font color="#CC3333">MP1 bets t125</font>, <font color="#CC3333">CO raises to t450</font>, BB folds, Hero folds, MP1 calls t325.

Turn: (t1147.50) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

River: (t1147.50) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t1147.50