I think with that number of sound sources, I'd want a 4 channel sequencer... stillson hammer is discontinued... & metropolix is only 2 - I'd look at the erica black sequencer... it can do a lot - pitch, modulation & cv per channel, midi interface and it can do random...
I generally agree with @HGSynth... probably 1 modulation source and then a load of utilities... see my signature...
definitely a matrix mixer, something like happy nerding 3 * mia, comparatot, end of chain mixer, sub-mixers, more vcas etc etc
"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