Is this your first rack? It's super hard to comment on such a minimal rack without knowing your experience and what you aim to accomplish. That being said maybe you want some kind of output module, an attenuator/attenuverter, modulation sources (LFOs/smooth random/chaos), a VCA or two, a mixer and maybe a clock. Envelopes, filters and wavefolders are also fun. I have no experience with the Stochastic Inspiration Generator so I'm not sure what it does exactly so I kind of ignored it.
If you're just starting out maybe consider getting basic building blocks instead like a sequencer, VCO, VCF, VCA and a filter and learn from there or in VCV and then when you feel comfortable expand with the "cool" modules from Mutable and Make Noise. Just a thought.