$120: 1 table Sit and Go TAJ

[Mikey]

First mistake was buying into this touranment in the first place.

I didn't look at the structure.

Players start off with $1000 in chips, blinds start at 25-50.
This tournament pays 1 place only.
Blinds move every 20 mins.

We are at Level 2.

I am in the BB with a post of $100 and the SB is to my right with $50.

Everyone folds to the button, who has limped in about 3 times in the first level but has never raised, he's an older gentleman who resembles a degenerate gambler, was smoking cigarrettes fiercely outside before the tournament began. The SB is a nice guy, he trys to play good, but he's not that great of a player.

the SB and I had a confrontation when he limped from the SB at the 25-50 level I checked with 96o.
we were the only two in the hand.
Pot $100.

The flop came down As 6c 8c.

He checked I bet $100 he called my bet.
turn was a T.
Check. Check.
River was a blank, check, check.

He turned over Td9c to take it.

Well now, everyone folds to the button who thinks for a second and limps.
The SB limps.

Now there is $300 in the pot.

I have ATo.

I have $700 behind me.

The button has $600 behind him.
The SB has about $800 behind him.

What is my play?

Check to see a flop?
Raise an arbitrary amount?
Raise all in since my opponents showed weakness by limping and I can put there tournament mortality at stake.