It used to be Best Buy because one of my friends used to live pretty close to one, and we had this whole tradition where a group of us would play games until about 2 am, then go stand in line and act like a bunch of idiots while freezing until it opened.
That is, last year was the first year we deviated from Best Buy as well, the sales sucked. We went to Frys instead and are probably doing that this year as well.