I got a very good deal on AN micro, bloom and grow, so that's what I'm using. More important than buying extra nutes, I would say the SINGLE MOST IMPORTANT THING you can do to ensure healthy bud production is treat those girls right -- no nutes at all for 2 weeks, then 1/4 strength for 2 weeks, then 1/2 strength for the rest of the grow. What's on the label is full strength, and it will kill your plants.
I started all wrong -- germed two seeds in the "seed" strength listed on the Micro label and burned both, killing one. The other one barely made it. So a week later I germed one more seed to make up for the one that died, and this time did it right. I did water only. Within 5 days, she was more advanced that the original one I had burned. Two weeks later, the younger one is flourishing gorgeously! Every time I see her, she's got more leaves, is branching out and the leaves are bigger and bigger. She's like a plant on steroids -- and she's just had 1/4 nutes for 3 days now. The original one, which is a full week older, is now half the size, the leaves are tiny, not growing much, looking very sad. I'm going to keep her in the pot, but everything I do now I do for plant 2. I pray she's a girl!
In about 2 weeks I'll go to 50% strength, and that's where I'll stop.