FWIW...
In Keara's flying fortress I got an epic ring from the chest with the Scorpion Earrings (+68 HP, +5 Critical Chance, +0.11 Mana Regeneration, with one of the enchantments being a level 10 Healing Aura).
Fighting Ba'al, he dropped an epic ring (+71 HP, +6 Critical Chance, +0.1 Mana Regeneration, with a level 6 Healing Aura enchantment). I reloaded for that fight a few times, and got a better upgrade for my bracelet.
It wasn't until FoV (level 37) that I found anything better (+82 HP, +7 Crit, +0.12 HP Regen), the first time I visited the jewellery merchant. Somewhere not too long after that I found an almost identical ring, but with +0.13 HP Regen, and those are what I am using on level 42.