1. why buy the doepfer quad vca and then replace with veils? - just buy veils!
  2. do you really need the output module? - probably not - if you are going to play live you might want one, but then probably a balanced one - if not often they are unnecessary, or can be replaced with passive attenuators - this may differ depending on where you live and how good your mains power is...
  3. more utility modules would probably be better - I like to think (very loosely):

sound sources < sound modifiers < modulation sources < utilities

which generally gives you best bang for the buck - ie more variety (in patching)/less money

"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