buy facet or wait for annihilus ?

hello

im slowly trying to get the recommended gear by darkhumility for my artic blast druid. You can check my gear there i believe : https://www.projectdiablo2.com/character/Bruiid

what do i prioritise if i get some loot? how do i choose the facet, is the cold dmg or the minus res more important and do i aim for -5 or -4 is fine?

or keep everything until annihilus and then buy facet slowly? there is also the +1 ring that cost more than 1hr

i dont have even one HR, best i have now is a Mal

thanks for the help