Debatably the best on hc
there are 3 robes in the dex robe catagory at lvl 50
"Mystical pixiesilk robe
Level Req: 50
+74% Enhanced Effect
+53 Dexterity
+3% Damage Return"
"Mythical pixiesilk robe
Level Req: 50
+55 Dexterity
+13 Intelligence
+1 to 4 Mana per Attack
+1% Parry
+1% Glancing Blow
Rare pixiesilk padded robe
Level Req: 50
+49 Dexterity
+5 Critical Strike"
Personally Id pick yours