more utilities, more utilities, more utilities...
they are your plumbing, they are what allow you to have more interesting patches...
take a look at my signature - it's a basic guide to getting the most versatility for the least money - then go away and think about it... and think about it some more...
it may mean you need an extra row to fit them in, it may mean that you take stuff out of this rack and replace with different modules, it may mean you don't do anything (but this generally means you haven't thought about it deeply enough)
"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