$50 Max - River play?

[Mr. GQ]

How are people playing this river?

BB is unknown, no prior reads (he just posted)
Hero is medium/tight and aggressive


Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
8 players

Hero: $60.10
BB: $48.25
CO: $26.95
MP2: $23.25
Converter

Pre-flop: (8 players) Hero is UTG+1 with 8[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/diamond.gif[/img]
UTG folds, Hero calls, MP1 folds, MP2 calls, CO (poster) checks, 2 folds, 2 folds, BB (poster) checks.

Flop: Q[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img] ($2.25, 4 players)
BB checks, Hero checks, MP2 checks, <font color="#cc0000">CO bets $0.5</font>, BB calls, Hero calls, MP2 calls.

Turn: 8[img]/images/graemlins/heart.gif[/img] ($4.25, 4 players)
BB checks, <font color="#cc0000">Hero bets $2</font>, 2 folds, BB calls.

River: 9[img]/images/graemlins/spade.gif[/img] ($8.25, 2 players)
<font color="#cc0000">BB bets $8.5</font>, <font color="#cc0000">

[Rythm]

I'd just shove here. I'm not worried about a better hand and I think he'll pay off a shove with most of the hands he'd call a smaller raise with.