What of my rather expensive indulgences are DIs...I own quite a few of them and use many for quite a few differing applications (such as input buffers...or impedence matching in fx chains), often not being what they were designed for.
Some of my faves:
Avalon U5: simply the best sound I have found. Pure tone of your bass. But it is pricey...and worth every penny.
Radial JDI: incredible DI box..again a bit pricey, but I love it.
Fishman Platinum Pro Eq: very nice box..great Di and preamp with a lot of options. Well laid out eq, and a very smooth and musical photo-optic compressor which works very well for bass.
L.R. Baggs ParaAcoustic DI: originally designed for acoustic gtrs, this little wonder works great on bass...parametric and notch filter...phase switching, very good balnaced DI.
Raven Labs APD1; next the Avalon this is my fave. Just gorgeous tone, with many applications thanks to the switchable/mixable sidechain loop. dead quiet....marvelous box. And engineers love it.
Retrospec Juice Box: great tube Di...quiet flexible...yes it colors thigs but in avery cool way. Now out of production they are a bit hard to find.
ADL 100G: another tube DI..very pricey, bt what a great sound. This is what you might find in many top notch recording studios. Spent a small fortune on mine, and so it never leaves my studio.
I have also tried the Sadowsky, and Agulliar DI, and found them to very good..yet not quite up to the level as those on this list. IMHO I rank MXR and Sans Amp quite low ( I do own both of these..but rarelybuse them myself. In that same area of budget there is the venerable Countryman Model 85, which is THE standard active DI).
As a point of interest... I don't think Fodera makes a DI. Their Model 2000 preamp, which I also own, is very good, but does not have a balanced DI output.
Max