I have a tELHARMONIC; it's relegated to second rack.... very conventional. I'll trade it to you for something interesting.
I tried a Mysteron. If you like resonators, IMHO Rings is better (I have one and don't want to sell it).
I have a Synchrodyne. Twitchy. Quirky. Needs external modulations, but then it really shines. Worth considering,
especially if you have the space and the coin for the Expander as well.
I have a Loquelic Iteratas. I like it a lot. Not For Sale

Although you may want to go with the new Loquelic Iteratas Perdicio,
which includes a normalled ADSR/VCA right in the same module so it's really a _voice_, not just a nice gnarly VCO. I'd get one
myself but I'm waiting for wallet recovery after an Easel Aux Expander. :-)
I have a Hertz Donut Mk II. It's second rack, not bad, but if you didn't gel with the DPO it's kinda similar. It's not a clone, it has more than one
internal mod bus, but ... well, it's a Harvestman version of a DPO; it can do TZFM but only on the internal modulation path, not via the jacks.
Try one if you can before buying, see if it works for you.
An Aperture (double filter) is interesting and has a nice twitchy growl; it tracks acceptably as a VCO.
You might want to consider a Radio Music (microSD card player) - there's a microSD loadout that turns it into a
chord organ, which is kinda nice. 1V/octave and all that....
Finally, more modulation is always good. Get a Brain Seed or a Turing Machine with a Volts if you don't have one.
And a Maths. You need more Maths. Maths is the unacknowledged love-child of Eurorack design and Serge genius.
- Bill
"Life is short. But we can always buy longer patch cords" - Savage