I like the way Mass Effect did it. You could have your helmet off on planets that were inhabitable and could breath. The helmet was always on when you were in space or a planet with no oxygen. It was a nice feature.
[b]Edit:[/b] SilverKnight565 said the same thing in one of the replies. Great minds think alike :D
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True, that would be cool. Though, from what I've understood all planets are habitable for humans because of the Traveler?