Armor Upgrade Help

So I did ??? with some friends at level 80. Im almost level 90 now and I was wondering what good armor I should upgrade too? Im kinda hesitant to get rid of the cosmic bonus because is so amazing. At this point do I start making builds? Loot bonus/xp etc. Gear towards my specific damage? Or what? Any helpful advice is welcome. If it helps Im an assassin with an alazarin as my main weapon.

 

90-100
But if you wanna be safe
Keep the cosmic till your 100 and spend your time grinding from 90 onwards while in spare time gathering stuff for the build you want

 

get 100 or 101 with cosmic then make ur build

 

Always remember to completely unbalance your skill points. I have 5 in 2 skills and 103 in another, and I'm doing great. Also cosmic armor should work fine if you have other means of elemental defense. Your build doesn't matter as long as it works until doing whatever it is level 100/101s waste there time on.