redundancy is not necessarily a bad thing - there are multiple functions that you will want more of than you think - vcas/mixers/attenuators - as they are incredibly useful for both audio and modulation
you need vcas sooner rather than later - I would go for a quad cascading one - veils perhaps
voltage block is already quantized though so you can drop the separate addac quantizer
something else missing is utility modules - these are probably more important than voices (although you need voices) as they will allow you to merge, modify and multiply modulation sources - and therefore make them more interesting
I would recommend - links, kinks and shades as a good starter set - other modules are available that will do the same thing - but for the price and size it's hard to beat these - wmd/ssf toolbox might be a good alternative to some functionality along with other modules to cover the rest - but don't underestimate doepfer for utilities - they are often exceptional value for money
also that roland env gen/lfo is quite big for what it is - maybe batumi and/or zadar would fit better - especially in a 9u case (good case choice btw!)
"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