Attitude, Sea of Seeds, or Herbies. Or, if you can find enough strains you like, I have heard good things about Sannies, which is probably who I will be using next. Specific breeders I can recommend from experience with are Mr. Nice, Cannabiogen, Next Generation, and the four S's (Sensi, Serious, Soma, and Sagarmatha) and I am trying some stuff out from Mandala right now, because I appreciate their business philosophy and pricing. And ther as far as best yield and best buds go, are you trying for indicas, sativas, or hybrids, and do you have any kind of desired effects, flavors, colors, or scents?