on energetic vs. mellow, yeah it is the strains, they make a hell of a differance. i usually smoke indica-dominant bud, but right now i have some nice sativa-dominant green.... it IS a somewhat energetic high, it's more of a mind thing than a body thing really.... i'm not really "stoned" like i am when i smoke indica, not nearly as much, in fact. i feel like my brain is transmitting shit to my eyes.... it's weird to describe but maybe that's something you'd like better