im in the process of building a eurorack system in a tiptop audio mantis case for my Dark Ambient project.

what i have so far
Synthesis technology E352(is on the way)
Malekko Quad Vca
XAOC Tallin VCA
Tiptop Audio Forbidden Planet
Doepfer A-124 Wasp filter
Ladik m-171 pannable mixer
Make noise maths(will get this next month)
considering either a Z-dsp or Erbe Verb

but dont know much about utilities,what are essential in a setup?preferrably in a small hp size?

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