QUOTE(Conquest101 @ Sep 20 2010, 03:28)

I lose some damage compared to my current Heaven-sent robe
No you don't, you can have a lot more damage bonus from divine proficiency, than you have from holy elemental damage, so small gains holy elemental damage will do a better effective damage increase than the same gains from divine proficiency.
i.e. +50% holy elemental damage, 0% holy rating, 0 divine proficiency:
if you increase +5% of holy elemental you'll have increased holy damage by 0.05/1.5=
3.3% -> before: (1+0.5), after:(1+0.55)
+0% holy elemental damage, 0% holy rating, 200 divine proficiency:
if you increase 10 points of holy proficiency you'll have increased holy damage by 0.05/2=
2.5% -> before: (1+(1/200)(200)), after:(1+(1/200)(210))