You are so kind to mention you built a system similar to mine!

Look here. You have a good idea to start with. Since you are on a limited budget use what you have. Liquid Karma is great stuff...As far as Barricade??? the LK will make your rez happy enough. If you can't afford it. Get superthrive. 1/4 tsp gallon... B vits and Hormones

buy General Hydroponics 3-part...easier to come by,
AN and GH 3-part are the same thing.

If you use ROwater/distilled water, then you need calmag+.

voodoo juice is awesome, but expensive, so I would wait on that.

Liquid Karma and Hygrozyme is the additives I would use on a budget.

AN additives I use...Voodoo Juice(when available)
Bud Blood...1st week after transition flush(1 week only)

Big Bud...until...I want to finish(weeks 2-5? of bloom)...

then, I use Overdrive. week or 2

I flush with Final Phase or Florakleen (have both) Florakleen is also great for washing the salts out of your hydroton.

GH has a full line...similar to the botanicare additive's

You could go entirely with the pure blend pro.
Botanicare's Organic nutes...I use these for my peppers/tomato's
add: LK, Calmag+, Sweet,...see where I'm going with this.
and Hygrozyme

I used to follow/adapt to the AN website's calculator, but now growing clones I am using a tweaked lucas formula.
1-5-10 veg.....Calmag+, Lk, Hygrozyme.

1-8-15 bloom.....Calmag+, Liquid Karma,
and Hygrozyme all the way thru,
IN Bloom Phase
ADD: Budblood, BigBud, and overdrive consecutively as stated above.

Hope you can decifer my rantings...Goodluck lw