Best nickel white gold alloys

I usually make my white gold with palladium. But when I have jobs
that are only piercing work, I would prefer to make a nickel alloy
so I can save my ($) palladium for white gold jobs that involve
soldering. Do you have favorite alloy recipes for 14K AND 18K white
gold? Are there any alloying problems I should look out for?

Thanks for any suggestions,
Janet in Jerusalem