5/10 NL...Easy River All-In?

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6 Handed 5/10 NL on Prima. We all have about $1k to start.
BB in this hand is a really weak, loose player. Button seems decent, a little on the tight side.

I open T [img]/images/graemlins/diamond.gif[/img]T [img]/images/graemlins/heart.gif[/img] for $35 in MP. Button reraises to $100. BB cold calls. I call.

$300 in pot. Flop comes 2 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/heart.gif[/img]T [img]/images/graemlins/spade.gif[/img]

Check, check, check.

Turn A [img]/images/graemlins/spade.gif[/img]

BB bets $152, I raise to $450. Button cold calls. BB calls.

River 4 [img]/images/graemlins/spade.gif[/img] ($1650 in pot)

We all have $500 left at this point. BB checks. What is your play?