There are some strains with high CBD and nearly zero THC! Checkout Bedrocan and CBD Crew (Shantibaba).
But when you put aside medical purposes, I doubt that these high CBD strains will be psychoactive by any standard measures. Have you got any experiences with CBD extracts? I think that effect will be similar.
It has been said that THC is more heady and cerebral effect and high CBD is associated with more stoned or couch-lock effect. But current research shown that there is particular terpene behind this effect.