Cwejman, Livewire, TipTop Audio, Doepfer etc... Get your euro on!
Quite a bit of talking about filters above. Many people say filters are barely useful with complex oscilators like DPO and they advise to pair them rather with the LPGs. I'm almost in the same boat, because I've purchased the DPO recently, but I bought a filter mainly with my 2nd oscilator in mind (ALM MCO). Those who allow for the possibility of using filters with complex oscillators pair them with not bread and butter filters like WMD Aperture, Mannequins Three Sisters or Intellijel Morgasmatron. Correct me if I'm wrong.