Re: octave fuzz suggestions
I've really liked the 'octava' portion of my Pigtronix disnortion pedal, and it looks like they do it as a stand-alone as well. Responds very well to playing dynamics, neck-bridge pickup changes and gets appropriately ring mod-y with any non-perfect intervals like you would want it to.
An interesting feature of the disnortion pedal is that you can run the 'octava' clean with no fuzz or od, not that it is the most usable sound on its own but it makes it easy to pair with any fuzz you want. Not sure if this true across the board, but my unit is a tad noisy.