my favorite sativa is orriginal haze by the flying dutchman. It is pure sativa unlike neville's and jack herer. Jack herer is also extremely expensive and takes many a pack to find a true jack h. mom. I had to go through 3 packs to get one and I am happy for sure, but it is not the highlight of my garden. as with nevilles haze, it is more potent than the orriginal but doesn't have as much of an up high. I would go with the flying dutchman's orriginal haze. you can get it at seedsdirect also, but I would recomend going to www.drchronic.com