I went ahead and took the advice on the Mantis and picked up one last week in black. I also added more utilities as you can see, the quad lfo, dual vca, a mixer, triplatt and the noise source, oh and the FEG (which is a really nice looping ADSR). And I splurged on the Data. I'm not going to add any more modules in the near future as I want to spend time using the ones I have and learning more about each. After that I have 64hp left. I don't plan on adding any more of the 4hp slim line modules as they are not as easy to use as the larger modules. Having these slim modules seems to work when they are space out, but definitely not right next to each other as knob turning then becomes a real challenge.
Again, thanks for the suggestions.