I'm not much on the energy drink scene! I do like an occasional 8 oz Red Bull when I'm 10 hours into a 12 hour run. Not sure it gives me energy, but I like the taste!
I've tried the Monster, but could never drink one of those big sugary bastards in one sitting! They actually made me energyless!
12oz Red Bull Wild Berries about an hour after a Cherry 5 Hour Energy Shot. But, gotta eat something along with it or your stomach will start to get upset.