AA river decision

[Warpe]

Villain's pretty loose/donkish. I've seen him chase a few draws, bet bottom pair, top pair no kicker, etc. His check/calling is getting me worried though. Bet for value here or just check?

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

Stack sizes:
UTG: $16.80
UTG+1: $111.30
CO: $71.45
Hero: $43.25
SB: $50.20
BB: $129.20

Pre-flop: (6 players) Hero is Button with A A
3 folds, Hero raises to $2, SB calls $1.75, BB folds.

Flop: 3 T 2 ($4.5, 2 players)
SB checks, Hero bets $4, SB calls $4.

Turn: 5 ($12.5, 2 players)
SB checks, Hero bets $10, SB calls $10.

River: K ($32.5, 2 players)
SB checks, Hero ???

[mxiu]

I prefer a check. You might be able to squeeze a little bit more out of him if he has a mediocre hand, but I'd rather check behind and let him show his club draw, rather than have him fold it.

[Warpe]

My bad...

River: K ($32.5, 2 players)
SB checks, Hero bets $27, SB calls $27.

Results:
Final pot: $86.5
Hero showed As Ac
SB mucks Ad 3h

So much for only getting called by a better hand. I 6 max.

[DaHorror]

Without looking at the results, this is an easy value bet against a goofball at 6-max. If he had a better hand he would have led the river - even if it was weakly in an attempt to get you to come over the top.
Here it looks like he's just calling down with a pair again.
Something in the $15 to $25 range should be callable.