When am I pot commited?

[Aironc]

I have little MTT experience. Mainly play limit with a few tourneys here and there. Was wondering about this hand/situation.

Pacific Poker 40 man SNG. Third level, blinds 25/50. Average stack 1175.

Stacks

Hero(t740)
Villian1 (t3120)
Villian2 (t930)

Hero is MP1 with A [img]/images/graemlins/club.gif[/img]J [img]/images/graemlins/diamond.gif[/img]

UTG calls t50, UTG +1 calls t50, Hero raises to t250, 5 folds. UTG raises all-in t3070, UTG +1 calls t870, Hero????

UTG has been at my table the whole tourney and I've seen him do this play twice with 99 and 77. Other villain just moved to my table three hands ago. I guess I would call against UTG hoping to be in a conflip but other Villians overcall threw me for a loop.

Should mention next level coming in 2 mins, so paying t150 in blinds with 460 left in two hands. Call or fold? Thanks in advance.