Looking at your Opera Tonearm i think youcan use a wide range of cartridges, but please make sure about effective mass of the tonearm, as i can see you can even swap the arm tube (longer is for lower compliance cartridges). There is a Dynavector KARAT on the image from tonearm manufacturer, this model with very short diamond cantilever must be excellent! I have DV KARAT-17D2 mkII , even previous model was great, i also tried 23RS Ruby and was very impressed. They are not very expensive. Maybe you can ask tonearm manufacturer why he decided to use Dynavector for advertising his tonearm online.
I actually bought the turntable with the 17D3 Karat, but the cantilever broke a few years back.
It was an awesome combo and then I got the xx2 which improved on the bass.
Time to get a new cartridge.