ok so maybe you could add some of the things that you think you want and then we can critique that and add the things you actually need
here's a few hints - you may want and you will need some of the types of modules mentioned:
to connect to your other studio bits and pieces - a midi to cv module (and possibly a cv to midi module) or something like a expert sleepers es8 or 9 - neither of which will require quantization as the output will already be quantized - possibly to talk to a computer/DAW
possibly a sequencer - which may or may not include a quantizer - you may want more than one of these - possibly a trigger sequencer and a melodic sequencer for sequencing pitch (v/oct) and possibly gates
a quad cascading vca - I lik veils - clones are available - as it has enough gain to be also used as an input module if needed (most vcas do not have this)
an lfo - probably multichannel
a function generator - I like maths, as it has the best documentation, particularly the 'maths illustrated supplement'
a mixer (for combining the outputs of the oscillator)
a mixer for combining modulation sources (I like matrix mixers)
an end of chain mixer - to combine different sounds and output to ? headphones/mixer/monitors?
possibly an input module - so that you can amplify external gear to modular levels
some utility modules to help you copy signals (muult) and modify them
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities