Which panasonic tv should i buy for gaming?

I have decided to buy a 42 inch plasma tv from panasonic. I will only be using this to play video games and do not like led or lcd for playing games on. which modle should i buy? the s2 series or the s30 series? the only difference i see is that the s2 has 1080 lines of moving picture resolution. I heard something about the s2 having bad gamma but i dont know what that means. any sugestions? should i wait and get a newer 2011 TV?
 
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