For variety, bang for the buck, i like using the single seed centre or any place you can get single seeds. Finishing up my first barneysfarm grow of red cherryberry, reddragon, red diesel, and g13/haze. Am at day 64 12/12 indoors, have had aone of the cherryberrys hanging in the closet for @week and just tried some of the dried top and can say wow! balanced cerebral and body and long lasting, not even cured yet. Red dragon sb more up, not sure about the other 2 but variety in there. All are yielding huge except reddiesels are a short squat, large budded, large fan leafed plant. The fan leaves on the diesels are red and the buds are purple.
If you want one strain with top quality and great variety, my fav, mr nice supersilverhaze.