if you wanna go super cheap, and only have (1) Fert to add to your nutrient solution.
then I would suggest HydroFarm Grow, and they make a bloom too. Chemical fert.
$10.00
General Hydroponics makes some good products
there Flora series is decent I used it before.
so is there Flora Nova series.
there not to expensive.
$70.00 to 120.00
If you wanna get into more expensive nutrients
then Dutch Master is a premium nutrient. this stuffs made for growing herb.
right around $200.00
Advanced Nutrients is top of the line stuff.
if you get everything thats in there feeding schedule your looking at
$350.00
Van de Zwan makes a premium nutrient. thats a little over
$200.00