did you have any direction in mind? more voices, signal processing, upping your modulation game
what sort of music are you making - and what do you want to make - this often helps in module suggestions!
how much rack space do you have available???
what do you find yourself using the disting for mostly - 1st thing would be to get a dedicated module to cover that use of disting so you can use your disting for something else!
and remember - you can never have too many vcas - so a quad cascading one is a good investment
"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