400NL - Three Barrels - Cagey or dumb?

[SamG]

400NL, 6m. Button is 18/11. SB is 35/20. Effetive stacks are about $400. I have a TAGish image (I think).

Preflop: 3 folds. Button raises to $14. SB calls. I call in the BB with A [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img].

Flop: 7 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/diamond.gif[/img] (Pot $42)

SB checks, I bet $30, Button calls, SB folds. After his flop call, I put Button on a mid-to-high pocket pair. I thought if I kept firing he might lay it down.

Turn: 4 [img]/images/graemlins/heart.gif[/img] (Pot $102)

I bet $80, Button calls. Hm.

River: T [img]/images/graemlins/spade.gif[/img] (Pot $262)

I move in for $282...

Good spot for 3 barrels or is this suicidal? This is how I would play trips for what it's worth.

Edit: I know I probably should have bet more on the turn if I was planning to push the river.