Big NKS Fan !
Great Reply and mist timely ! I had not noted the Bernard bundles and will do so now. Somewhat aware of Macauley and Vult and will consider with confidence now. Believe I have Core, but not obvious looking thru installed lists. Lots to review per your helpful comments !IMO, Next step should definitely be Cherry Audio Core. There are tons of basic building block modules in Core that are not in Nucleus. I probably use modules from Core in almost every patch.
To me, the PSP stuff is just OK -- I find that I rarely use it. Lots of it is effects, and plenty of us have tons of effect pugins (which can be used within Voltage Modular via Core's Plugin Host). Some of the PSP synthesis modules don't have enough control voltage inputs IMO. Plus, they're a bit big (they take up screen real estate).
The Benard bundles aren't cheap, but they're awesome especially if you like randomness, chaos, evolving control sources, advanced control structures, and/or if you are into stochastic/algorithmic composition. If you just want predictable patches (like, say, you would get with a MiniMoog or something), you won't need that, but if you'd like to have patches that evolve or are different every time you play them, the Benard Mega bundles will get you there. I have the first two, and would pick up the third one if I had the money ATM.
If you want awesome filters and oscillators with tons of character and a wide range of possible tone colors, I would recommend both of the Vult bundles.
So, get Core first. If you want to incorporate randomness and algorithmic stuff, get the first Benard Mega bundle (or bundles 1 and 2 if you have the money). If you want characterful sound sources and processors, get the Vult stuff.
P.S. - the Macauley stuff is good also, and the Benard Mini bundle is very handy. And the Cherry Audio Year One collection contains some good stuff also.
Thanks and regards