PF Checkup and river decision(?)

[Ainex]

This hand isn't too interesting but I am trying to give myself a basic check up and get some opinions.

Preflop: I've only played 50ish hands with CO but he has tended to LAG'iness so far and I was pretty sure (conjecture only) I could get the limper out with a raise. Given this I decided on a 3 bet. Do you like a PF 3 bet trying to get a CO you don't know much about to fold or prefer a call PF and c/r decent flops vs the LAG instead?

As for the river 3 town seems easy enough vs Unknown BB. Agree/Disagree?

Party Poker 5/10 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, CO calls, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB calls, CO folds, Button calls.

Flop: (10 SB) A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, Button folds.

Turn: (6 BB) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

River: (8 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero ?