Tea, though herbal tea if it's not morning otherwise it affects my sleep. Mainly because I could never bring myself to like coffee for some reason. Also, going to Japan made me develop a liking for green tea.
Which do you prefer, @"Genesis"?
I used to drink coffee in the morning before get to work. And at the office I take a cup more coffee. Why? No special reason, just an old habit. I'm not drinking tea because it hurt my stomach after drinking it.