Honestly I dont think Anakin turning to the dark side should show a really pissed off Sith Anakin. Anakin knows what he's done is fuckin wrong, but he insists in doing it for just one reason, Padme. No fuckin dark side thing, just a Faustical tragedy. Perhaps some pissing off with the Jedi, in some situation as Bingo proposed. But this is what I wanted to say in my previous post, Anakin is no fuckin Vader until he gets in the suit. Anakin is forced to do what he does by the situation and his fears, not because he willingly succumbs to Palpatine.

BUT once the tragedy is consumed, once he knows certainly that all he's done was in vain because he couldn't save his wife, then Vader appears. There's a situation in Expanded universe, of an suited Vader fighting a clone of Maul, and this clone asks him "what can you hate so much to defeat me"... and Vader responses "Myself"... I honestly think this is an interesting point and something Bob could achieve if he is willing to with his edit. Vader takes his strenght from the Dark side by hating... hating himself, hating himself for ruining his own life and this hat for himself is in some point, a feeling of guilt, and this guilt is the ultimate seed of his redemption