I had some doubts about the gold after seeing it in the Apple Store. However, under more normal lighting (I think that the Store lighting is very warm), it looks fantastic. In the Apple Store, the gold was a little obnoxious.
And the black and gold color combination is perfect. My iPad is Space Grey because I wanted the black bezel, and I do sometimes regret the white bezel on the 6+. I really, really hope that they end up switching the iPhone to a black/gold combination as that would look spectacular. (I'm half Chinese, the gold lust is probably genetic.)
I'm thinking about getting one but I can't decide on a color. All my iOS stuff is gold, so I kinda would prefer to match. But the space grey looks good to me because it really makes the screen pop. I like the gold, when it's closed, but for some reason, when it's open it looks too yellow, just like what you're describing. I know the lighting sucks and contributes to that. So it's good to hear how you feel. But I haven't seen many pics even that prove otherwise. So I'm not sure.