300bb deep vs. probable fish

[snowbank]

Full Tilt Poker, $2/$4 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

UTG: $632.20
MP: $376.10
CO: $2,123.20
BTN: $398
SB: $59.80
Hero (BB): $1,265.55

Pre-Flop: K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
2 folds, <font color="red">CO raises to $14</font>, SB calls $12, <font color="red">Hero raises to $60</font>, CO calls $46, 2 folds

Flop: ($134) 7[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $75</font>, CO calls $75

Turn: ($284) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $175</font>, CO calls $175

River: ($634) 6[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $399</font>, <font color="red">CO raises to $1,813.20 and is All-In</font>, Hero ????

villain seems a bit on the fishy side. haven't tangled in a big pot yet. he's been sucking out on a bunch of people to get his stack. normally calls my cbets, and possibly trys to float quite a bit, at least it seems that way from the few pots we've played. I have $500+ left facing his raise. can you find a fold here?