I stay away from those drinks, much rather drink a double espresso or take couple of 60mg-Ginkgo Biloba pills with EarlGrey tea + brown sugar to get me all wired up mentally as well as physically.

....but if I had to pick an energy drink, it'd be low calorie MONSTER. Good ingridents and a cool taste! That drink also has viagra-like effects on me!
I can totally picture F1 smirking with a light bulb over his head!

~TL