The NOW product is low on GABA in my opinion, the others are workable.
Buy the inexpensive NOW GABA powder and add that in slowly, 1/4 tsp more each night. There was a post on the forum previously looking at "powdered sleep aids" and good info regarding GABA and other aids is in that post. A 300+ serving bottle @ 1/4tsp is < $15 (more equal to 60-90 servings at the doses I prefer).
In my limited experience, the list of sleep aids in your NOW product have products that work independently of the others and not synergistically/additive. For that reason, I would feel safe in adding more GABA to it.
I am also on the more frugal side and prefer to tailor any treatment using individual components instead of an all-in-one capsule where I pay for convenience. In the scenario I mention, you can alter the content of your all-in-one with one component that may work and cost less than $15 to test. It may replace it.
Valerian root relaxed me, but did not induce sleep. I have not used Hops or Passionflower.