Actually, it turns out that I have consistently better results by not having coffee at all. I haven't bothered yet to purchase theanine supplements to test if it's from theanine or from more leveled dosage of caffeine over the day.

After two coffees in a row I tend to procrastinate (more), and tiredness comes quicker. I enjoy drinking one tea after another, I lose taste for coffee after I've had about three per day (I lose "craving" after one-two per day) in normal conditions (but not for example in the beginning stage of a cold/flu).

and why not just a caffeine pill?