xhonzi - I know the idea of Vader being a sort of title that is passed down has been suggested earlier too, but I'm sorry I just don't like it. I hope this doesn't sound like I'm always disagreeing, because from the moment I read it (earlier in the thread) I just thought it was fine in The Princess Bride, but wouldn't work in Star Wars (for the reasons TheBoost mentioned). Having said that your post did lead me to consider something.

We know that at some point there has to be a showdown between Obi Wan and Anakin, which Obi Wan wins. However, do people see that as Anakin who we all know is Anakin (pre Vader armour) or Anakin who is hidden beneath the helmet?

I've always imagined it as Obi Wan fighting Anakin in the Vader armour. That way when it comes to their fight in A New Hope we should all be thinking that last time Obi Wan won, so it shouldn't be a problem, but then when he lets Vader win it has more impact.

TheBoost - I like the idea of a group of jedi following Anakin (though I don't think it should be many because I don't think there should be too many jedi crowded together - perhaps 4), but I dont think I would necessarily make them have red lightsabers, I would say perhaps only Anakin should, but I am admittedly undecided about this. But rather than having them killed by an explosion, I think Anakin should be ordered to kill them all, this way the idea that Darth Vader hunted the jedi to extinction has even more validity.