Not the most creative, but very practical because you can buy it in stages (Labyrinth has its own case, Hector (has its own case), case/utilities). Plus, as you learn more about specific modules and get more stuff (if you do), these will still be useful, and you can out them back in their own cases and use the space for more stuff.
The Hector is a suggestion I go to because it has so many Mutable Instruments modules ported to it. Marbles and Grids are great generative sequencers that are both there with great interfaces. It also has great effects and synth sounds from Mutable (and in general) that will work with the Labyrinth and cover areas it can't (as the Labyrinth does for the Hector with its filter, oscillators, and hands-on elements).
But, of course, make sure you do some research, play with VCV Rack or Hexen, and narrow things down so you know what you want and why when you start spending. There are a lot of ways to do generative modular – it's one of the things the medium does best.