I'll add this:
Make sure you save all those Bronze Cuffs and Silver Rings you find everywhere in the early part of the game. You'll notice the former is +1 AC and the latter does nothing.
This is good: Silver Rings are thus one of the very few items that can be Blessed/Enchanted +14 (with Enlightenment) that keep the full effect of their enchantments.
Ardibren's Relic, which is already nice, can also take a lot of enchantments before it gets maxed; hang onto them through your games (i.e. don't let the shopkeeper take them).
The Wizards Blade can be Blessed +14, making it the deadliest weapon in the game. The Lance of the Lady (found every now & then in Cet's Pyramid) can also take a lot, but only Valkyries can use it -- and it's shockingly ugly
Note that the amount of money required for 14 Blessings is astronomical, and almost certainly requires cheating.