i personally use lucas formula. you can do it 4 ways: GH micro and bloom, GH flora duo, GH floranova bloom and GH maxibloom (dry powder). the only one i didn't like was floranova bloom because it seemed like there was a lot of stuff that settled at the bottom of my res/bucket. the cheapest is maxibloom but you need a way to weigh out grams pretty accurately. i'm using floraduo at the moment and i think it's my favorite.
check out lucasformula.com for more info
ionic is good stuff too for dwc. you'll also need boost if you do use ionic though.