check or bet

[AZK]

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">CO ($2167.72)</font>
<font color="#C00000">Button ($1843)</font>
SB ($1325)
BB ($1107)
UTG ($3181.44)
UTG+1 ($1427)
MP1 ($6271.94)
<font color="#C00000">Hero ($3837.68)</font>
MP3 ($1998.72)

Preflop: Hero is MP2 with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $10.
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $80</font>, <font color="#666666">1 fold</font>, CO calls $80, Button calls $80, <font color="#666666">2 folds</font>.

Flop: ($270) A[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $175</font>, CO calls $175, Button calls $175.

Turn: ($795) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, CO checks, Button checks.

River: ($795) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>


My default is to check since I'm probably only going to be called/raised by the flush by at least one of these players. But the CO is a total donk, he doubled me up a few hands ago preflop all in AQ vs 33 (side info: He minraised UTG the whole table called, I raised out of the blind, he minraised, I pushed, he called. His minraises weren't real hands). He plays too loose and too passive for his looseness when he isn't leading the action Button has done some donktastic things in small pots, and is generally quiet...

Edit: If you check, do you call a bet, and if so, how much?