I tend to use a light to medium grey on black because I don't like the mega contrast of white on black. But for the purpose of your survey, I answered 'white on black'.
Likewise. Also, I don't like highly saturated colors. I've tried a few different color schemes and while I did like Solarized Dark I keep coming back to Zenburn[1] for its muted, low contrast palette. I haven't found anything better.