I love envelope filters. My top five that I own in no particular order:
Vintage Mu-Tron III or Tru-Tron 3x - the vintage has a slightly dirtier drive which makes it sound filthy & funky, the Tru-Tron has a huge amount of headroom, with an added mix setting, a built in preamp. A very powerful filter, slightly cleaner sounding than the original. Both set the standard IMHO for how an envelope filter should quack.
Moog MF101 LPF - super warm, fat and synthy, and if you add an expression pedal and plug it into the cutoff then you can change sweep direction and get huge synthy sweeps
Chunk Systems Octavius Squeezer (has the 00Funk MkII filter in it). Really wet sounding analogue filter, and on the Squeezer fully programmable with presets.
Frostwave Funk-a-Duck - a crazy resonant filter loosely based on a Korg MS-20 synth, slightly unpredictable and not the easiest to dial in.
And yes I'd include the MXR M82 BEF in there too. It's not a particularly fat sounding filter (as it is band pass) but it's super rubbery and is very reactive your how lightly or hard you play. The Decay and Sens controls are really interactive, and being able to blend in your clean signal is a killer feature. I run a MXR M81 preamp before mine on a passive bass which makes it sound more awesome.
Special mention to the EHX filters: the Enigma Q Balls is very flexible with a huge array of sounds and very interactive controls, the Stereo Talking Machine is something a little different, a digital formant filter, very vocal and can sound crazy, but with a more standard Wah and Bassballs too. You can also change sweep direction, add distortion and LFO etc, a really underrated filter on bass. Both the EHX pedals you can plug an expression pedal into and both have blend, attack and decay controls.
Also the Mu-Tron Micro-Tron III or IV is as close you will get to the original (though with admittedly less headroom).
I'm sure the C4 and Spectrum will come up many times as recommendations and I think SA have 100% knocked it out of the park with both these pedals, but for a simpleton like me, I like a standalone, tweak on the fly analogue filter.