I have a Hertz Donut mk2, and love it. It will certainly do gentle and beautiful things, including lovely FM. While the sines and triangles aren’t pure and clean, they do sound fantastic through an LPG where just a hint of the edge comes through at the peak of the attack, and it cleans up nicely throughout the decay.
I’m looking forward to the full announcement/demo of the mk3; I understand it adds a third oscillator, but I wonder what else it might have in store. 
Kermit is my first “sell-regret-repurchase” module – I miss its warm fuzzy digital self and had to get one again. Nothing else quite sounds like it IMHO. (Warps may become my second example but I’m still pondering that one.)
As far as Euro wavetables go – to me they’re not inherently that exciting, but like a plain analog VCO, it’s all in the character and in what you do with it. E370 is my most used module by far, mostly because of the cloud, FM, phase modulation stuff that it does; I typically leave it on wavebanks that start with a sine or triangle and morph into something more complex down the line.