+2 deflection bonus to AC is worth 8,000 gp.
+2 resistance bonus to saves is worth 4,000 gp.
Protection from physical contact by summoned creatures is probably not worth very much ; summoned creatures are very weak. I'll say 6,000 gp.
Partial protection from enchantment effects and possession is pretty valuble, so I'll price that at 20,000 gp. (This should go up or down depending on how you interpret protection from evil. If it, for example, protects against charm person and suggestion, it should be much more expensive than I price it here.)
I'll reduce the value of the deflection and resistance bonuses to 80%, because they only work against evil creatures.
Add it up, 20,000 + 8,000 * .7 * 1.5 (secondary power multiplier) + 4,000 * .7 * 1.5 + 6,000 * 1.5 = 37,402 gp.
I'd price a ring of protection from evil at about 38,000 gp.