Thread: Rack suggestions
Quadrax and Zadar for envelopes and more since you already have Maths. Triple Sloths or the Zlob Diode Chaos for random/chaos. VCAs are kind of a personal thing. I like the FSS Gristleizer VCA for a distorted character and the AJH MiniMod, but you might want to add some quantity with something like Veils or the Intellijel Quad VCA. For 8 channels of stepped modulation I definitely recommend the Voltage Block. I love that thing for giving me that last little bit of movement that I need.
Have fun and good luck!