i like to make my own
get some diet powdered energy drink, strength of your choice, flavor of choice,Of course it has to be blue raspberry since there has never been a better flavor in the history of mankind!!
little creat, little beta alanine, ok lot of beta alanine, maybe some citrulline, etc etc.

Like the variety, like the changes in flavor and strength. shit I don't need 300 mg of caff to go do arms right, but leg day, gimme some more of everything!!

on the other hand, 1. r.m. is good, but I add more creatine and beta to it...sometimes

I imagine a little TNE would be good too, but no experience to draw from here
-c