I just picked up a Compression pedal, and am looking at the Agular Tone Hammer. I am working on getting my tone the way I like.
Even though I play only with fingers, I find that I can get a lot of variety by altering where I play, closer to the neck or closer to the bridge. I can really change the tone substantially by pulling the string with the flat of my fingers or just the tips. When I use just the tips, I can get a crisper snappier tone. Sometimes I emphasize that tone by striking the string with the tips in passing, in other words, the finger tip hits the string in the center of the arc of motion, with a follow through.
Never really heard a delay or distortion pedal that I liked on bass. (Not even Cliff Burton, God rest his soul)
Might like to pick up an Octave pedal some day. Saw a "Power Chord" pedal that looked pretty cool too.