some advice you can take or leave - ditch the beauty case
work out the modules you want and those that are actually needed to support them (probably at least as much space again) and then add 30-50% for expansion and then find the case - allowing at least 25% headroom on all power rails - I allow 10mA/hp/rail for unfilled space
this way you will have a modular that will accomplish your goal and you may not get the urge to buy another case in 2 months when you outgrow the beauty case
you do not have to fill the whole case at once (you may want some blind panels so you don't short anything though)
I started with a 6u/72hp case - it lasted 6 months before, with only 12hp left I decided I wanted Maths and bought a mantis as well - 4 years or so later and I have 1500hp...
"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