kinks is always a good addition for modulation imo
other than that I would want a decent mixer - preferably something that has both mono (with panning) and stereo inputs - so maybe split between 2 mixers - probably I'd go happy nerding panmixjr and stereo mixer
I'd also probably look at adding another filter or 2 - at least one of which I would want to be able to produce sine waves and accept v/oct and track a couple of octaves accurately
"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