What would be your range of hands to push?

[bathroompants]

I'm playing a live tourney and its down to 3 people...payouts $2100
$1000
$550

I'm in last place with about 50k-60k in chips and the other two guys had about double that.

Blinds are at 10k/20k so I'm in danger of being blinded off.

The person to my right seems to be a pretty good player but an occasional garbage collector, and the person to my left is a complete beginner and calling station so its almost impossible to steal blinds.

Obviously I had to find a place to move in and fast, but I think I might have played it too tight. What do you guys feel the acceptable range to push all your chips in, in these conditions would be?

I'm having a hard time trying to reconcile my Kxs fold that could have doubled me up. Would that have been a good play taking in consideration my 100% chance of being called?