I've been using the Botanicare Pure Blend Pro line on this grow and I'm really pleased with the results. I've got 5 girls, grown indoors in ReadyGro soilless mix in 3 gallon pots under 800watts of T5 fluoros.
Anyway, I'm 4 weeks into flowering, am into the PBP Soil bloom, and using the Liquid Karma and some Cal-Mag as well. My plants love the Liquid Karma..it's done wonders. I've also just started using molasses to sugar up the buds and my plants like that too.
Anyway, the PBP line is great stuff, nearly 100% organic from what I can tell and good for the plants. I will say though that their recommended feeding dosages are too high. I'd scale them back by 20-30% to avoid burning. (e.g. they say 30mls/gal, I use 20Mls/gal.
I'll do a slightly shorter flush period since these are organics too...1 week should do it.
Good luck!