case : LC6 is a decent choice - @Lugia will be along soon to tell you the LC9 is better valuee for money (which it is) and so are Mantises... but not by that much - personally I think the LC9 is a little bit underpowered...
Modulation: good start
Utilities: good start
Stereo Mixer: it really depends on you - personally I would want at least 2 stereo channels and 2 mono channels that can be panned - for now I wouldn't worry about it
Purchase Order: sounds like Beads and Arbhar are a way off - I would probably want some form of effect at the start either a filter or a multi-fx: fx aid xl seems to be the best of that bunch at the moment
"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