So AipX is a good thing to have on hand for the random nem that pops up on a new frag or something, kalk paste works well too. Nudis are awesome but they can get costly depending on what size tank you have and how many you have to add before they start breading. Filefish are good...As long as they have the taste for pest nems and not your corals (I also feel like they can't get into the tiny crevices in a lot of liverocks to eat the whole thing so you need to always have the fish to keep the nems at bay).
But I have to say hands down, my favourite choice is peppermint shrimp. Now just like the filefish, not all of them have the taste for aips. What I do is get a couple from two or three places, that way if one batch doesn't like eating them hopefully the others will.
My 2¢