25/50 Full Ring unraised pot bottom set

[MTBlue]

Basic checkup my fullring game is a little rusty. CO is arguably one of the best fullring players in the world. BB is unknown presumably donkish, bought in for his full roll.

Two questions, c/c c/f or bet river? If you bet how much?

PokerStars No-Limit Hold'em, $50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

<font color="#C00000">Hero ($5000)</font>
MP1 ($1088)
MP2 ($1050)
CO ($6659)
Button ($7889)
SB ($950)
<font color="#C00000">BB ($1951.25)</font>
UTG ($1697)

Preflop: Hero is UTG+1 with 3[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/club.gif[/img].
UTG calls $50, Hero calls $50, <font color="#666666">1 fold</font>, MP2 calls $50, CO calls $50, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: ($300) 9[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Hero bets $250</font>, MP2 folds, CO calls $250, SB folds, BB calls $250, UTG folds.

Turn: ($1050) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero checks, CO checks.

River: ($1050) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets?