Every bassist could use a Tech 21 Sansamp Bass Driver DI (Version 2). Super versatile, built for war and capable of subtle and not so subtle tones, it's a must have DI. Studio quality sound, low noise floor, can be run off phantom power if you go direct. It's the good stuff. Our bassist has the Geddy Lee pedal, that's cool too and so is the Dug Pinnick Fly Rig.
Super agree on the Sansamp. I have the Deluxe DI at church (three presets, there's another bassist and we each have our own settings) and it does a great job with no fuss.
I also have an MXR bass envelope filter...that I leave on all time, and really don't use as envelope filter! More like a second EQ for tone shaping. I can't explain it too well, but it imparts some kind of magic that I miss when I don't have it on.
An MXR bass octave and Stone Deaf Fig Fumb (their version of a Big Muff) are also on the board, but used less as you can imagine. Still, I like having the option. Had a Boss bass chorus at one point but never really cared for it.