It seems like you may be ready to move on. The PS3 has its differences from the xbox. Namely functionality and obviously some exclusive games. What exactly are you looking for in a game system? Have you ever had Sony before? As the previous poster also mentioned check the state of your warranty or at the very least give microsoft a call and see how much you'll have to pay if any coverage has expired.
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"Power is the reason that we all are fighting for, control your body, your soul and heart. Yes- some of us who surrender are like lambs to the slaughter; get the power & try harder to reach the next stage."
-SMT III