well i don't know about FM, but as far as i know, intellijel's $500 cylonix shapeshifter is the SICKEST wavetable oscillator in the world as it goes beyond simple crosstable morphing into stuff i can't understand, but that sounds insane.
https://www.modulargrid.net/img/imagecache/600x586_3196.jpg
https://www.modulargrid.net/e/intellijel-cylonix-shapeshifter
i was wowed by the variety of vocoder sounds it can do and the funky scratching effect it did morphing between two presets. i would build an entire system around JUST that rack.
mutable instruments has a lot of wavetable type modules. braids is popular and the one i liked best, not so much clouds, but only because i'm not into ambience & pads, but they have a pretty wide variety of interesting non-analogue modules you should check out for yourself. i also like rings which is kind of a "resonance modelling" VCF, but is also considered a modulator.
finally, the other wavetable oscillator i liked the sound of was synthesis technology's E340 cloud generator for its percussive type sounds & atariesque "kuzo" sounds
while NOT a wavetable synth, but ACTUAL 4 operator FM, you should check rack hogging akamie's castle out too. my eyes glazed over at the complexity of the concept, though i liked the tones, and was put at ease by another demo that essentially said "i don't know what it's doing... no-one does, just twist knobs & see what happens" LOL i can wrap my head around that.
intellijel's cylonix CYCLEBOX is also interesting, but nowhere near as much as the cylonix shapeshifter i was confusing it with. one other bonus of the shapeshifter is that it comes with an INDEPENDENT wave folder you can process other VCOs with and it has some wavetable LFOs that can also serve as oscillators and vice versus.