I know this isn't a pure sativa (some even say it's indica???), but my Greenhouse Seeds Trainwreck is a pretty nice mix of i think mexican (or columbian), lowland thai, and afghan, and flowers in 8-9 weeks. Harvest at 100% cloudy, and it's a pretty trippy ride :hippy:

(GH says its Trainwreck is from the Arcata clone...)