I'm hoping Amplify02 will be the best I've tried thusfar. I also have Cardio Breeze, which is good for all day energy, not just for a workout pump.
The thing about the 5 hour energy is that it does give slight jitters. I bought three cases of these things after I tried them and now I have stopped being such a proponent because my eye gets a twitch.
mosty sustaned pumps i got from were from amp 02...but for a fighter like you fowler....i would say pumps fuck with us...i would say stick with just a little caffiene if you need it