Vortex Sound Research

I have a question regarding starting with modular synthesis. At current I have a minibrute 2s, and my plan is to get a rackbrute 6u. the goal of my setup is to have something that with at first expand the timbrel capabilities of my minibrute, but then, as I amass modules, become something that I can sit down with for about an hour or so and create something inspiring. I can already do this with my minibrute, but I'd prefer to dive deeper. Any suggestions for first modules? I was thinking plaits or maths.