I always find silver dyes in post-Searing, no black though...
+energy mods come in a few varieties:
On one-handed rods, wands, canes, truncheons, and deadly cestas, there are the +1 to +5 energy while hexed/enchanted/health is above 50%/health is below 50%.
Also on one-handers as well as offhands are +10 to +15 (not sure about the lower bound) with -1 energy regen.
Staves have up to +10 energy base modifiers, which is dependent on the staff requirement; if you have less than the requirement, you'll get pretty low energy.
Staves also can have Insightful Staff Head upgrades, which give +1 to +5 energy, which isn't dependent on requirement.
There's also that +5 energy sword which was nerfed in the update...
As for item drops, the best drops I've seen PvE are from SF right now

But other than that, pretty decent items drop in the desert and beyond.