All my iPhones up until the iPhone 4 were black, my 5 was white/silver and my 5S is white/gold.
To be honest, I'm not sure I like the look of the purported white/gold iPhone 6 that much. I'm hoping those fugly white antenna bands and white bands round the edges are hidden or coloured the same as the rest of the rear, or the top and bottom pieces of the rear are coloured differently to the central piece, much like the iPhone 5s is today.
If that's the case, and the champagne colour hasn't changed, i'll go for the white/gold again. If not, i'll probably go for the black/grey/whatever-they-decide-to-call-it model to hide the different coloured bands that I think just look simply awful, plasticky, cheap and poorly designed. It's almost like they were the Friday afternoon design decision. I'm still hoping that the final version that Tim will unveil will be different though.
I'm probably skipping the 6 since I got the 5S not that long ago, but IF I do decide to get it, it will be the space grey/black option. I like black fronts so the screen blends in when the screen isn't on. I had the 3G, 3GS, 4, 4S, all in black. For iPhone 5 I had it in both black and white, but stuck with white for a little longer only because it seems to hold up a little better with use. For iPhone 5S I originally got it in gold, but eventually got the space grey version (which i am using now). I like the little contrasts around the phone. How the home button is slightly lighter in colour compared to the bezels on the front. How the metal sides are darker than the chamfered edges, the little rings in the lightning port and earphone jack, and the 2 screws on the bottom.
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