I was thinking that - but it would seem too cartoony. I thought that scene was a bit too "Galaxy Quest".
Darth AJ - Mustafar is the best, and original, setting and always has been. I love the lava planet - we are just thinking up other versions of the duel. No harm in that.
Anyway, I pictured Ord Mantell because it would tie in to the whole mechanical hell thing, sharp junk lying everywhere. Seeing as they can afford to have lava flowing all around them with nice flashy effects, then I doubt we'd see the same chaotic effect on anywhere but Mustafar. I reckon if this scene was made twenty years ago, Mustafar would have become something more like Ord Mantell I think.
Ord Mantells junkyard setting would have been awesome for a Grievous battle at least. A fight in a junkyard is always cool. I remmeber in the Shadows Of The Empire game where you landed on Ord Mantell and had to ride a train, jumping from train to train. That would have been awesome for the duel. A fight on a speeding monorail type train, jumping and dodging, before arriving at the factory/smelting place where it all ends.
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Oh dont get me wrong, im glad its gonna be where it is, but like i stated befor ethis is hypothetical, and i think that Tatt would be a cool alternative. But yes as Cylob said, and as much as i hate to agree with him, it has been set this way for YEARS, and any other way would be...."weird". I remember walking around with my friends when they re-released the OT in 97, talking about him falling in lava. But for the reasons i said before, i think Tatt would be cool as well.