Good question. You are on the right track...when I would have the chance for a custom made cartridge, I would prefer AlNiCo's. But to be honest, these alone are not the secret, there are outstanding cartridges (Miyabi for example) which sound very life-like and some don't (XV-1s) or you go to one of these FR-cartridges, they have a kind of Pysical Force which is rare to get. Even today. But then you need a different Arm and a real high gain Phono section.
But to go back, the Helikon is right, when you have the chance to get one used, try it. There is worse out there.