How Would You Play This One?

[WiredPear]

I had a tough hand last night, and I'm wondering if I should have played it differently.

Okay, I'm playing a $5+.50 SNG on Full Tilt. There are four players left. Play has become incredibly tight. Everyone is raising and stealing blinds left and right. At one point, we went 12 hands without seeing a flop.

The chip counts were roughly

Player 1 - 8000
Player 2 - 1550
Player 3 - 1900
Hero - 2050

PRE-FLOP
Blinds are $100/$200
Player 1 and 2 fold. Player 3 (SB) calls. I have Ac7c. I call.

My standard play at this point was to raise here to steal the blinds. I had done it with lesser hands before. But at this point, I want to knock this guy out. I'm hoping to take him out if I can hit a flop.

FLOP
As Qs 9s. I check and he checks.

TURN
6h

I bet the pot - $400. He min raises to $800. I have $1250 left and decide to go all-in. I'm hoping against hope he doesn't have the flush and that I can push him off the hand.

Would appreciate any comments.