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Hi Steve,
I'm no expert but I imagine that the brown colour is due to the refraction of the atmosphere and dust. It's usually a lovely bluish green colour.
As for eyepieces, I like my 13 mm Nagler, but have to say I was pretty blown away looking through a 13 mm Ethos in my 16" at Snake Valley last year. There will be a lot of people who know lot more about the quality of these eyepieces than me and I think John Bambery (ausastronomer has had some recent IIS posts that you might find helpful. If I had a spare $500, I'd go an Ethos over a nagler if I didn't have either. I don't think that I would invest in an Ethos already having a Nagler unless cash was not an issue. Both are quite spectacular.
As you say, you'll have your ep for a long time, so its worth investing in.
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