PS3 and Smasung LN32A650

I'm considering to buy an LCD screen and currently i'm debating between the LN32A650 and LN40A650.

I would prefere the 32" since it's cheaper, but how would gaming with PS3 look on it?

Will there be any lagg and motion blur?

PLS HELP!!!

My biggest fear is that the LN32 will have some type of motion blur(or lagg) with games like resistance 2 and fast paced games. If the blur is minimal or both sizes have it it'll be no problem for me and i'll happily get the 32"