DNA gear kicks much butt. their sweet haze is my favorite, but both their lemon skunk & sour cream are distinctive too. their chocolope & cannalope haze are at the top of my shopping list.
TGA's jack's cleaner 2 is nice & trippy with touchy feely euphoria effects, but his jack the ripper is more popular. sannies' killing fields is potent & popular, but their jack is supposed to be "real deal". several claim that sensi seed's jack herer is legit too. it's expensive though, so it should be nice.
i'm checking CH9's jack & jack 33 out too. i think their jack might have been above average, but overshadowed by JC2 & sweet haze in my last grow. the jack looked indica, but didn't smoke like it.