She is fine, they is fine, even using he all the time is OK if you just can't be bothered. I tend towards using "she" in gender neutral situations, just on account of my natural inclination towards feminism, but I think it's a very small potatoes kind of thing.
Like you said - as long as we don't try to invent new pronouns, I'm down. HELL NO to the idea of "xi" or other invented pronouns, just no. Anything else is reasonable.