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I honestly think the Niche is a great fit for the Linea. Relatively simple/uncomplex in an aesthetic package, both pretty forgiving to use. User experience is the priority.
If you wanted something fancier and a different sort of profile, Zerno Z1 is shiny and has great build quality at a reassuringly expensive price.
Maybe a Weber Key if you want to drop even more money and are after that same Niche conical grind vibe but better?
Honestly I don’t know the range. The equal of the coffee machine, in grinder terms.