You should add the Xotic BB Preamp to that list; it has a great, usable gain range, and a 2-band EQ.
Another option is one of the Bogner pedals, particularly the Blue. I have the Uberschall, and I think it works great with my Mesa dual rec.
Alternatively, since it sounds like you really like the ZW: why not stack it with a dark sounding boost, like the z.vex SHO?