zadar is great, but watch out about the enocders - especially if you are buying used and are the type of synth user that constantly wiggles - I'm not so much and I just bought a new one - so fingers crossed

fx aid xl is a great and versatile fx unit in 6 hp

I would probably want something like this https://www.modulargrid.net/e/rebel-technology-mix-04

which basically gives you

ModularGrid Rack

and after that there will be the search for the next case - hint go bigger, much bigger

"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