That is funny Obi1 does have some memory issues in ANH. What are the chances of the saber luke uses in ROTJ being Qui Gon's or if not his at least partly his. I know luke gets the parts from ob1's hut, ob1 has Qui Gons saber but didnt use it in ANH. I think that there are going to be a lot of lost swords in the next four hours. I also have heard that there will be a second special edition after the end of EPIII, perhaps we will find out then. I think it makes sense. The irony would be brilliant.
This is a picture of Dooku's and Anakin's saber. As you can tell, Anakin's saber is exactly like Vaders only with a silver ignition end. Vaders was black. It isn't the saber Ben gives Luke.
http://www.starwars.com/collecting/news/2002/01/img/hasbrosabers_bg.jpg