I agree with Adywan...

If you are going to do a Darth Vader temple scene then it should be the Vader that we see from ANH but more clean looking and still using the original helmet and armor.

efx Collectables have just released their Limited ANH Vader helmet which has a clean "spray" paint job and has less of the original defects which would make sense seeing as he's just been put into the suit.

I have both the ROTS and ANH helmets and now that I see them side by side, the orginal ANH helmet wins hands down.

Here's a render that was done a while ago.