I'd completely agree on your priorities...
if you keep the 4ms modules you can always leave them in a drawer for a while see if you miss them or not before selling them! then the question is either: what to take out or get new case... my answer to this has always been new case... which is why I have 8 of 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