VCAs are a must. Intellijel Quad VCA is great, it's 4 VCAs and it can double as a basic mixer, and they're not very expensive. You could also go with two Xaoc Tallins, those have a nice overdrive effect built in. Or a couple Doepfer A-130-2's

You also need some dedicated mixing that you can use without having to repurpose your VCAs. I'd look for a stereo mixer for your output and also at least one small mixer or averager you can use for CV or sub-mixes, like your drums. Jornalouge Add 2 is very useful and compact. I like the Doepfer A-138-j a lot too.

Ghost is a good module but you might want some other effects. I'm not really sure what your goal is so I'm not sure what exactly to recommend. Likewise Ochd is a great module too, but I think you could benefit from some more complex LFOs too. The Zadar and Batumi that stefvanriet mentioned can do this, there's also Intelijel Quadrax and loads of others.

Other envelopes/utilities that would be useful: Maths of course, also Schlappi Boundary or Cosmotronic Delta-V as an alternative.