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Yes, it would be helpful to know what kind of music you are making, and what you would like to achieve.
I think I would want some effects, so an FX Aid XL might come in handy. Peaks is a love-hate module for me. I have the mini-clone Pique, and while it has a lot of functions, they sort of defeat the purpose of modular because you can't really control anything with CV. I would look for something with more patch points that your Mother 32 could actually interact with. Maths or Quadrax would be fun in this regard. Plaits would add a range of voices. A random or chaos module like the Wogglebug or Triple Sloths could be cool...
Let us know what other gear you already have and what you want to accomplish by adding to your Mother.
Have fun and good luck.