may i suggest skunk #1, durban or c99 ? not all are pure sativas but mostly
Az
caraibe and destroyer from cannabiogen are mostly sativa (respectivly jam and thai strain) ... just for example
Power Plant is quick, IBL and has a good speedy sativa high.
not the best smell/flavour but it gets better if you grow it organically.
i have a PP cut that i'm making some crosses with - just harvesting the first seeds now.