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Like others mention, buy a big case BUT only a few modules. Take time, learn each deeply. Maybe something like this:

1x BIA- I have one and love it!
support modules
filter
another VCO to complement the BIA for basslines, etc.

Here is an example:

ModularGrid Rack

I added the Noise Engineering modules for most of the essentials: clock, attenuator, mixer, LFO for modulation as well as a filter and synth voice to complement the BIA since Loquelic Iteritas Percido is pure awesome for many things.