To answer your question, I have my coffee with a bit of 1 or 2% milk. Cream is too "much" for me. It usually ends up sort of caramel coloured when I've done it right.
That said, I don't subscribe to the idea that good coffee is bitter. Starbucks' coffee is VERY bitter, though. They roast the piss out of the beans, and they do end up very bitter. Most people seem to associate that bitterness with the quintessential "coffee" flavour. I don't. A good coffee can be both flavourful and smooth.
If there's a Good Earth nearby, try ordering a light roast from them. It has a great flavour to it that Starbucks' "Pikes Roast" or whatever it's called is completely devoid of, but is also very smooth. Not bitter at all.
I used to take a tonne of milk and sugar in my coffee. Then I realized that my coffee sucked, and I was just using those to compensate for the bitterness. Then I tried good coffee, and I realized that I could easily drink it black, but could still add a bit of milk to get it exactly how I like it.