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I agree with everything discussed above. I feel like Harmonaig (as cool as it is) is complete overkill in this rack. I would be more inclined to include a uO_C instead to get some chord sequencing and a lot more in a small package. I am not smitten with the Clouds/Monsoon sound or user interface, so I would also encourage you to wait for Beads if that is the type of thing you are going for.
Finally, I believe the black panel Maths was only included with one of the Make Noise package systems, so it is not readily available. If you do actually find one for sale used, you will pay a premium just for the perceived rarity. I would recommend just getting the standard silver panel version. If you really need a black panel version for the aesthetics, I think there are some aftermarket options available. Everything else looks like a great start into the modular world.
Have fun and good luck!