If I'm not mistaken rootmedic's two bottles are less expensive than Seachems line as well.RootMedic(my product) comes in 2 bottles(the only fertilizer that comes supplied this way). Micro in one, macro in the other. The concentration will beat that of Seachem all day, every day.
Combining them with RootCaps from RootMedic(RootMedic Complete, Complete+, Iron Complete, etc) makes a full coverage option.
Pfertz comes in 4 bottles(another sponsor here). Similar nutrient content. They also make a root tab that would do you well too.
Aquariumfertlizer.com offers a package of dry ferts that can cover all your bases.
I wouldn't use PMDD. It just leaves you with wrong proportions and no phoshpate.