Diamond nectar does not offer quite the same benefits as floralicious plus. The humics are the only overlap. It's not useless, use it in veg maybe. It's just not worth the money. Floralicious plus is solid and I'd highly recommend it for your humics and sea kelp needs.
Big bud comes in liquid and powder and I wouldn't use either of them. Both have weird NPK ratios and I do not see how your plants would benefit from such an out of balance nutrient.
I think before you go spending all your money at the store on things that have cool names and colorful labels, do some reading on what plants require and how they can benefit from some of the additives currently out on the market. In short, your base nutes should be supplying all your essentials like N, P, K, calcium, magnesium, sufer, iron, zinc, etc. Your additives could include sea kelp, humics, beneficial bugs and carbs for said beneficial bugs, but these aren't required or even important like a solid, balanced base nute formula is.