General hydroponics 3pat grow, micro, and bloom are pretty good for their price 7-8 a bottle.
There are other nutes out there but the price can get steep when buying the larger sizes. AN Sensi AB is one of my favs
I really like Botanicare Pure Blend Pro (2-part) for DWC (Liquid Karma is good too). It's pretty forgiving and easy to have plants thriving on it with little fuss. I don't guess PBP is technically fully 'organic', but it's close enough in my book while still remaining practical and easy to use. You can skip buying the PBP Grow and just use the Bloom throughout if you want to keep things simpler (the amount of N in the Bloom is fine) and save some money.