FWIW I have a 6U 104hp wide rack already for this purpose.
I eschew effects, mixing and output as I use another rack with it that has an Expert Sleepers interface to pass all the audio into a DAW. I do also have outboard sequencing but find the Westlicht Performer useful for generating ideas and it's a handy source for basslines and complex modulation.

The combo of the Befaco Noise Plethora and Percall is nice for a bunch of noise based textures and atmospheres plus a bit of percussion with a difference.
The endorphin.es Black Noir is also a huge bargain, got mine used for £250 and that big DJ style filter knob is really effective.