So long story short, my buddy is a dick and decided to hold off on Neha like me. So his QX9650 is longer mine

Anywho, I've been looking at the Q9550. I heard the E0 stepping is "the" chip to look for but how much of a difference will it make in the end? Is it worth my time to hunt for one when I can easily get one with C1 stepping?
I've heard that the E0's have lower VID's and will suually clock higher. Any truth to this? or is it still kind of a luck game?