I don't drink coffee anymore but used to drink Cafe Mocha from starbucks, yummy.
The strongest coffee Ive ever had was Japanese iced coffee! When I was younger, I can drink coffee late at nite and go to bed fine zzzzzz. For some reason, I still can fall asleep out full of caffine, lol. Anyways, my friend took me to a nice Japanese resturant and encouraged me to order the iced coffee so I did. I had 2 that nite and later went to bed. I tossed and turned for several hours, and I was going ummm, why I can't sleep?? Finally figured out it was that damn iced coffee.