Hand selection short handed

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Playing a home tournament recently, down to 4 player, $600 in chips on the table and i hold roughly $300. Top three places pay. Iam utg, dealt K [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img] and raise blinds (which are $6-$12) to $30, guy behind me goes all in for just 25 more or so. Puts me in a position of doubling him up (which I did).

So the question is, I know that I must increase the number of hands I play short handed, but what do you all feel are the limitations of this (i.e play K-9, Q-T, etc. more agressively, but avoid rasing with hands like this one).

2- I am thinking that this play was a little more viable because of my big stack and what had been pretty tight play on the bubble. What hands do you push with in these situations?