"I was mostly concerned about utility/basic type modules and if I was missing anything obvious that would work well and compliment what I had in the case already, or just general essentials. Or if what I had didn't make any sense at all."
In that case, a few additional comments:
-- I find something like 4ms SISM or Tiptop MISO to be essential in almost any rack. Control signals so often need scaling and offset, and its great to be able to blend them in some way.
-- Intellijel Triplatt or something like that is another great utility to have; low in $s and HP, very useful.
-- for mixing, IMO there's a lot of options, and none of them are perfect, they are almost always bigger than I would like, and missing something I need or including something I don't need. IMO the main questions for mixing are i) how many channels do you need to mix ii) do you need stereo or not. I will be getting some Mixups when possible, but it may not be possible for a while. I would suggest the Doepfer Narrow Mixer (mono) if all you need is mono, as it is low HP and $s and will suit many basic needs.
-- lastly, I would put Instruo Ochd on your radar if it isn't already. I have Batumi and Ochd, Ochd offers lots more LFO signal in a small package. IMO Ochd offers a lot of bang for buck to get a patch moving musically.
Good luck, enjoy!