I think the only time I'll actually replace a DVD I already own is when they release the Blu-Ray discs of The Lord of the Rings. I actually expect the trilogy to be on single discs and have an even more outstanding picture quality (if possible
) I would probably do the same for Star Wars. There's no way I'm going to get a Blu-Ray of some drama with no special effects though. I really just don't see the point in an upgrade like that.