You don't have to. A cup of coffee a day is fine. I sometimes have two if I need it.
Yes, only some strong italian coffee can actually surpass the 200 mg limit. Enjoy your coffee! :)
Do you mean espresso? It actually tastes stronger, but has less caffeine. It takes 3 shots of espresso to equal one cup of regular coffee.
Here's the caffeine content of Drip/Espresso/Brewed Coffee:
Drip 115-175 (7 oz cup)
Espresso 100 1 serving (1-2oz)
Brewed 80-135 (7 oz cup)
Obviously these numbers are estimates at best.