Generic Situation

[beta1607]

This came up lastnight in a 50+5 on Party. Players A and B had been getting monsters and also sucked out on a few all ins to get their monster stacks. I wasn't sure what the most +ev strategy was at this point.

Blinds 100/200
Player A 4200 chip
player b 4000 chip
Hero 1000 chips
Player C 800 chips.

Is it correct to check/fold everything but AA-JJ and AK-AQ here and hope that player C just loses rather then risk getting bubbled? A and B are calling most raises so stealing is very difficult.

Part 2
After surviving to the top 3 with 800 chip stack should I push every hand preflop since I need to double up a few times before the blinds esclate again to get back in this?