When I first starting lifting, I was still very new to world of pre-workout supplements. My younger brother on the other hand was all about it, and would use some of the heavy hitters like Super Pump, N.O.Xplode, etc. So, I was curious and like the nutrition nerd that I am, I began to do research, and A LOT of it. My favorite starting place: Bodybuilding.com. They have a great pre-workout article here, and supplement forums (#ftw).
The right pre-workout supplements can boost your strength, endurance, focus, and muscle pump. I personally work out early in the mornings before work (5AM), so I was definitely looking for something that would give me the right amount of energy and endurance to push through my workouts. The two things I went back and forth on the most (in terms of ingredients within pre-workouts) were: