$12/180man SNG, PS - Final Table - 77 UTG: Push or Fold?

[bruno_pro]

I find this to be a tough spot given stack sizes and prize distribution.. I don't know where the dividing line stands but I think it would be 77 or 88, while 99 must be a clear push and 66 a clear fold... the blinds are huge though and M ~ 4, so.. what is the correct action? Is pushing a bit too agressive/-EV ?!

PokerStars Game #13277221803: Tournament #67367916, $11+$1 Hold'em No Limit - Level XVI (2000/4000) - 2007/11/16 - 13:59:10 (ET)
Table '67367916 20' 9-max Seat #8 is the button
Seat 1: StrokeShaft (36437 in chips)
Seat 2: bruno_pro (37270 in chips)
Seat 3: BigUnit2 (14346 in chips)
Seat 4: LonnyD (41644 in chips)
Seat 5: yogibear666 (17640 in chips)
Seat 6: seasonality (44450 in chips)
Seat 7: sjukov (33471 in chips)
Seat 8: bata_mija (36526 in chips)
Seat 9: rsmith6 (8216 in chips)
StrokeShaft: posts the ante 400
bruno_pro: posts the ante 400
BigUnit2: posts the ante 400
LonnyD: posts the ante 400
yogibear666: posts the ante 400
seasonality: posts the ante 400
sjukov: posts the ante 400
bata_mija: posts the ante 400
rsmith6: posts the ante 400
rsmith6: posts small blind 2000
StrokeShaft: posts big blind 4000
*** HOLE CARDS ***
Dealt to bruno_pro [7s 7h]
bruno_pro: ??