i think most 100% indicas have the couchlock stone as its called but there are some sativa indica crosses that do the same, i would say that the best way to find the strain for you is to visit a country were its legal (amsterdam springs to mind ( and try different strains yourself .remember everyone is different what works for your girlfriend may not work for you . me and my bird find this happens a lot were shes blitzed out of her brains an am sittin there stringing(means not stoned) with red eyes but no fealing of being stoned
the way it is dryied and cured can make a big difference aswell
in my personal opinion blueberry is one of the most stoney weeds ive smoked but thats just me other people say it gives them a nice day time buzz
good luck finding the one for you