This is really a personal choice.  The two main sub-species are Sativa and Indica.  While your mileage may vary, most people consider Sativa more of an "upper" or at least a cerebral head-high, while Indica is generally seen as more of a full-body high that leads to a more sedative "couch lock" state.  One of the great joys of indoor gardening at home is the ability to try growing all of these different varieties to determine personal tastes.That said, there are a couple that really jumped out at us above and beyond the others, either because of the quality of the end product and/or because of the larger yields:   Blackstrap from theautoflowerstore.comBlueberry Bliss from Vision SeedsPineapple Express from Fast BudsCream Cookies from Fast BudsBerry Bomb from Bomb SeedsNorthern Lights from Vision SeedsGreen Crack from Fast BudsBut don't over-think this -- it's pretty hard to go wrong with a reputable breeder.  Experiment and have fun!