@klooker To get back to your OP, with an Ittok, a good cartridge would be Linn's own Krystal. The Benz Wood cartridges are all good, but not that easy to source these days.
BTW, Linn's philosophy on upgrades is from the inside out...so the tonearm is less important than the power supply which is less important than the bearing etc., the tonearm is more important than the cartridge.
A cartridge that would be a step up over the ones mentioned would be a Lyra Delos, BUT you would need to be able to have it set up with greater precision than the others.