If they didn't change anything why the new model number?
They did change some minors (memory stick slot). One rational I heard mentioned is that Sony intends to reserve the XBR designation to the Plasma line only in future models.
I have all of the keep-cases out in the garage in a plastic tub, then I use DVD Profiler to print a catalog of selections.
You are more organized than me!

I tried to nudge Mom to come home with a plasma,(I like them) …just so there would be one in the family to play with. (something different). There were a few last generations models within the price range. But when giving her cons/pros one of the stats which bothered her was loss of brightness over hours used.

Take Care!.