Canna and H&G are piratically the same stuff. The guy that created H&G also created Canna, and all of Canna's stuff is made in H&G's factory, but on to other things...
Mad Farmers MOAB is hands down the best bang for your buck. Its a P/K stack with some added B-1 to reduce any shock, its dirt cheap at $15 for 100g of the stuff, and you can use it first week to help kick out your flower sites and the last two weeks to fill out your buds and help harden everything up.
Other options:
- Humbolts Big Up Powder
- Supernaturals Bud Blaster
- Advanced Bud Blood, pricey but damn good stuff
- Advanced Hammerhead
- Yellowbottles (Bloom) P/K
- GH Powdered Kool bloom and to a lesser extent Liquid Kool Bloom
- FF Soluble Trio
- Botanicare Hydroplex