Re: Funk pedals & stompboxes?
Mutron Evelope filter. If you cant buy one, build one.
This site is in Spanish, but search for "Sonidas" and it'll take you to some soundclips of the Mutron build:
http://www.pisotones.com/MuTron-III/MuTronIII.htm
+1 on the Orange Squeezer. If you cant buy a used one, they're pretty easy/cheap to build.
As for phase, There's tons of options. you really cant go wrong with a vintage Small Stone, though I'm not sure if they suck tone when bypassed like some vintage pedals do.
As for an OD, I can't comment since I'm not a funk player, but I'd imagine anything from the "tube screamer family" would be fine. SD-1, OD-3, TS-9, TS-7, TS-808, Arion Tubulator, Bad Monkey, Blues Driver are all options / implementations of pretty much the same circuit.