I drink WAY too much coffee. I love a nice dark roast, but there's something about diner coffee, too; I can pound cup after cup over a nice breakfast of eggs and greasy bacon. Diner coffee is one of life's underappreciated pleasures.
I have vowed to cut back on my total intake a bit this year. I find that once I get up to 6-8 cups a day, I tend to crash way too hard in the afternoons, and I become a total bear to be around on the weekends. Problem is, I can't really sub in any tea, because for some reason drinking tea (at least black tea) makes me vomit if I don't have much in my stomach. My body just can't handle something in the tea (it ain't the caffeine).
Decaf is a sick joke.
Coffee should be black, too. No sugar, no cream, no milk, nada. My old man taught me many years ago, learn to enjoy black coffee, that way if someone offers you a cup you can always say "yes" even if they don't have anything to put in it.