[Gogar]

Get the sugar free monster, the blue one. The sugar will make you crash.

Monster will last longer than coffee. The orange juice and alfalfa will give you a stomach ache.

Amp is okay, but is more caffeine-sugar oriented than the monster.

If you go buy the monster or whatever, get one of those 1.5 liter things of water, also, and follow the drink up with the water. You'll be up as long as you want.