you'll be lookinf for an indica then i guess, they are smaller and the stone is more of a sedated body buzz and they are quicker to grow, sativas are more energetic or cerebral grow tall and take longer. go for something like northern lights or some sort of kush, like hindu or master stay away from og and stuff like that if you don't want potency, if your really not that bothered about potency nirvana is cheap, some of their strains are reasonably potent though.
never tried it but yeah sounds like it, i take it you know about autoflowering then?