I play in a similar kind of band myself, here's my 2 cents:
Wah - Geezer Butler used a Tycobrahe Parapedal on NIB, the Wilson Freaker wah is an improved clone of this. I sold the Parapedal and kept the Freaker but I now find myself using an Iron Ether Xerograph with expression pedal now though as it keeps the lows throughout the entire sweep, whilst most wahs use a bandpass filter. Wah/filter goes first in the chain for me, sounds great going into fuzz/distortion. Put it after and it can sound a bit like a cheesy synth.
Overdrive - This wasn't on the list but I suggest you get one. It's good to be able to layer on the gain, first with a dirty boost, then with the full on fuzz. I tend to use a Catalinbread SFT set to low gain and leave it on pretty much all the time.
Fuzz - Muff based fuzzes are a good fit. Only problem with them is that they can sound mushy, which is good for slow lines, but if you want to play anything faster and want some more of the dynamics/clarity to come through, might I suggest either muff with a clean blend (like the Bass Big Muff), or a Boss ODB-3 (which sounds amazing through the right amp, e.g. no tweeters!).
Delay - I use an MXR Carbon Copy, but I don't use it for typical delay. I mount it sideways, crank the feedback and roll the side of my foot on the delay time knob to control the wild oscillation sounds whilst playing, which are fed into a Small Stone phaser!