I like Island Sweet Skunk, NYC diesel. (some of my favorites) They're pretty nice clear headed energetic yet mellow up highs.
Sour grapes is really good too. its an up high but nice and mellow.
Green Crack is good, usually an energetic or a hybrid high (depending on the phenotype), I've also had Green Crack that put me to sleep but no matter what the high was like, it was ALWAYS very potent!
Jack The Ripper is the most all around high I've ever had. The stuff makes you feel totally drugged. It is very potent.
Jack Flash was the MOST powerful weed I've ever smoked, a TRUE "one-hitter-quitter" longest lasting bag I've ever bought, no tolerance buildup, got me VERY paranoid... At the time I felt it was TOO strong lol. But now I'm like "Where can I get some Jack Flash?????" Supposedly they're are two different phenos of this plant. I've only smoked it once, but I'm guessing that it was the sativa pheno, but I'm not sure.
I've had Purple Haze twice. Two different highs. First one was a all around high similar to Jack The Ripper except slightly more energetic and much more psychedelic. The second time I smoked it it was a total couchlock. But both were very powerful.
AK-47 I've had one pheno that made me energetic and want to clean my whole house, then other times it was a couchlock high.
When it is the energetic Ak-47 is one of my FAVORITES!
My other favorites are Grandaddy Purps and Blackberry! They are just totally awesome PURPLE highs (all around happy, trippy highs and I would HIGHLY recommend both of them equally!