I followed John Davis for a while as I was into Nerve and JoJo Mayer's drum chops.
As mentioned above, John and similar players' aproach is the modular synth path and create their "modules" by using pedals.
There is other great fuzzes around, I use a Brown Dog as it has various flavours and a nasty gate too, but in the past I used the CoPilot Fx Orbit with great success.
Rather than going for his sound, use what you have available but using the same aproach.
There are some videos on Youtube where his older setups can be seen, I believe that he used a Line6 M9 for some of the filtering stuff (great digital unit btw), and to control all his midi gear he used a Moog MP 201 controller that is no longer in production.
I would also add some modulation, tremolo and delay to my setups when playing electro/synth with my former band.