Johannus said:

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.

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.

My idea has been that "The Duel" would be between Obi-Wan and Anakin in white Vader armor (more in line with the Stormtroopers he commands) sans helmet. When Anakin throws his lot in with Palpy, he drops the Jedi robes for blatantly aggressive white armor. Even if it's black, i don't think he should rock the helmet until medically required to do so.

Really, the size of Anakin's bad-Jedi contingent is based on thte total number of Jedi we want in the film. My idea is that there shouldn't be more than maybe 100 Jedi. Being a Jedi is like being a Knight of the Round Table, and a big deal. If, in the first round of murders Anakin and his crew whittle the number to maybe 20, minus the ammount who've gone bad, I could see a final battle of Anakin, maybe 4-6 fellow bad-Jedi, and a contingent of Stormtroopers going against Obi-Wan and a 10 or so remaining Jedi.

During this battle the remaing Jedi are slain, and Anakin's crew could be winnowed down to 2-3. Possibly this battle directly leads to Anakin vs. Obi 1on1 and Anakin taking his lava bath. That way, when Anakin kills his own followers, he does so as full-on Darth Vader.

Anakin killing his own Legion wuld be cool, but ideally in a shady way, just so Ep. 3 isn't too heavy in "Anakin killing everyone' lightsaber fights. Perhaps in a echoing of Anakin killing the kids in the actual PT, Anakin could have his men in a 'victory celebration' and while they're partying lock the doors, ignite his saber, and we cut away.

As for saber color, I like red for the entire legion for the following reasons. I really like the suggestion that all NPT lightsabers are blue, adding a level of symbolism to Luke's green one in ROTJ. If the Legion are all followers, toadies of Anakin's boldness and defiance, red-sabers show they're all copying him as well as making battles a tad easier to follow.

A scene in my outline has Obi-Wan confronting his best pal Anakin, who is now head of Palpy's secret police, and abuot 3/4 to the Dark Side. (another layer is that everyone calls Anakin "Skywalker" and later "Lord Skywalker" when Palpatine promotes him, except Obi and NotPadme. This scene would have Obi-Wan change mode of address, underlying the distance between the two men).

OBI-WAN: You can't serve two masters Anakin.
Anakin removes his lightsaber, and presents it to Obi-Wan.
ANAKIN: Take this. It no longer has any meaning to me.
OBI-WAN: Very well, Lord Skywalker.

After that scene, Anakin would begin to wield his redsaber, a sign of his no longer seving as a Jedi. In my outline, it's one of my favorite bits, and is echoed in Anakin's final scene with NotPadme, where he challenges her to chose between her duty as the betrothed of Bail Organa, and her passion for him, and she returns to him some token of their love, cementing that she's going to marry Bail.