final six and top five get a seat

[coolhandkuhn]

Playing in an online tourney on saturday...$10+1, final 5 get a $600+40 seat, sixth gets $85. We're down to six out of 337 starters. Chip Leader has $115k, 2 & 3 have $65k, 4 & 5 have 40k, and I'm bringing up the rear with 18k. Blinds are 1500 & 3000....After a couple rounds of this six man action, it's clear that the other five aren't going to get in each other's way...they all fold when I'm not in a pot, and when it's my blind, they all limp. I'm being targeted (and rightfully so). I get pocket fours UTG...do I push and hope to double up? Blinds are coming around next hand and I'll be down to 13.5k if I can't make a stand with any of those hands. If you don't play fours...what is the minimum hand you'll play in that spot? Any ace? What about a decent king? I need to double up to get back in the hunt, and quick...all thoughts appreciated.