Interesting $109 Bubble Situation

[UMTerp]

Stars $105+$9 Turbo. I'm posting this from memory, stacks are approximate, but close. It had been a prolonged bubble, and I had worked my way up from an anemic stack to put myself in pretty decent shape. Since then I'd more or less treaded water, being careful of the stacks that were likely to call, but trying to push every 4th or 5th hand to hold serve.

Blinds 300-600 w/50 ante

UTG - 3000
Button - 6500
SB - 800 (500 after posting)
BB (UMTerp) - 3200 (2600 after posting)

Button is a regular at this level, and a very good SNG player. He's well aware that even if the SB triples up this hand, he will probably win back everything he lost and then some in the next few hands by wielding his stack. He knows I'm a good player too. SB was unknown, but seemed solid enough.

UTG folds, Button pushes, SB calls, I have 88.

Call or Fold?