I can't stand FoxFarms personally. I don't consider it a good quality line. I used FF for a while and was upset by the way I got salting of the soil (lock-outs) pretty quickly. If you go FF, add extra perlite to your soil because you'll be flushing...

Look at the Botanicare Pure Blend Pro mostly-organic line for a comparable price and better quality.

Superthrive is useful for transplanting and for re-vegging a finished mother. Never use it on seedlings or flowering plants.