there's a difference between OD and fuzz.
in the fuzz world: zvex woolly mammoth, malekko b:assmaster, perscription electronics depth charge, chunk systems brown dog, MXR Bass Blowtorch, EHX English Muff'n (or Big Muff)...all really good. There's a million more out there, but you can hear a lot of them on youtube...
OD: ebs makes some good overdrives (valve drive & multidrive), fulltone bass drive MOSFET, SansAmps can give you a good overdrive...plus they make the XXL and VT pedals, then you can get expensive and go for stuff like the BJF BlueBerry, T-Rex Bass Juice, or stuff by DHA (Dave Hall Amps)...
go for it. oh yeah.