Hasbro would never do a Vader with multiple hands, they might create one which gives them the ability to select different hand sculpts for the hand/glove part of the arm, but they would use this feature to sell essentially the same sculpt with different hands time and time again.
I think the TAC/Tin version is definitely the best representation of Vader from ANH that we've gotten, so good choice on figure there. I definitely could have done without the removeable helmet on this figure, but oh well, it is what is is. Since it's Hayden's head underneath, you have to concede that this really isn't even Vader from ANH since that head should/would look closer to Sebastian Shaw at that point in time.
I've always considered this figure Vader, four-to-five years removed from the events in ROTS because of the removeable helmet, so a version w/o the removeable helment, ball jointed hips and the ability to clip a lightsaber to his belt would be the improvements I'd want to see to make an "ultimate" ANH version of Vader.