I use Kent Botanica exclusively. They are great and I have never had any problems with them, other than finding a 64 oz bottle of Botanica Grow, which has been hard.
Your main 2 ferts should be Grow and Nitro+. They will provide a solid base for your routine. I have some VERY heavily planted tanks and have never needed to use the Iron additive, but I do use the Potassium once per week. Grow has both iron and potassium, so your need of supplementation of either of these is going to be minimal. Also, I would recommend AGAINST using the phosphate fert unless you already have a very established tank and want some sort of growth boost. You will likely insure a nasty algae outbreak otherwise. I have also heard that supplementing iron when you don't need it will cause hair algae (or was it BBA?) outbreaks, so I would recommend against that as well, unless you see signs of a deficiency.
My routine goes like this:
Grow - Dosed once per day, per the instructions. I double the recommended dosage in my higher light tanks.
Nitro+ - I dose as needed, usually 2 times per week, per instructions
K+ - I dose once per week, per the instructions
This is a very simple routine and has worked great for me, so I see no need to complicate it further.
Two 1 GA desktops, a 5 gallon, a 2.5 gallon, a 10 gallon, a 20 gallon, a 25 gallon, and two 75 gallon tanks, all planted.
I am an expert on algae, so ask me if you have questions. I know how to grow it, just not how to get rid of it.