Redbull is shit. Sure it'll make you wired but have you checked out the list of all the shit which goes in to that drink? HOLY FUCK. It's really all the sugar which gets you going.
I perfer something called Buzz Water, It should be in the USA by now but i will have to check with my friend since he owns it.
They got two different kinds of bottles
100MG of caffeine
200MG of Caffeine
But it is so much more than the caffeine that makes it a great drink.It's loaded on minerals which your body comsumes and will replace lost electolytes
However, I can get 500MG caffeine bottles from him which are not "for sale"
so if you want those then let me know