Hipster maybe. Although they're a slightly different breed.
I think of beatniks and hippies as being different too rather than two words for the same creature.
Hipster: likes Apple products, has large plastic-framed glasses, wears scarves (male + female) and tight jeans.
Hippie (young): Microbrews, is very into fermentation in general, wears a lot of hemp products.
Hippie (old): Same as ever but hair is now gray or white.
Beatnik (old): There aren't really any young beatniks in the way there are young hippies I don't think. So beatnik is more a historical reference (Ginsberg et al) or an original beatnik who is now aged (like the old hippie).