Reddit mentions of The Upanishads (Easwaran's Classics of Indian Spirituality Book 2)

Not necessarily. There are quite a few translations that offer explanations to each section of the Upanishads that explain the meanings. Not to mention, with a basic understadning of Hinduism, you can unravel the meanings by yourself with a bit of deep thought and contemplation.
Anyways, I recommend this translation. I got it for an American friend who was interested in Hinduism and wanted to learn more. It gives basic explanations, while still allowing you to think on things for yourself:
https://www.amazon.com/Upanishads-Easwarans-Classics-Indian-Spirituality-ebook/dp/B004DI7R4W/ref=sr_1_1?ie=UTF8&qid=1498187230&sr=8-1&keywords=upanishads

Amazon India has got it lot cheaper.

http://www.amazon.in/The-Upanishads-Eknath-Easwaran/dp/8184950918/

http://www.amazon.in/The-Upanishads-Classic-Indian-Spirituality-ebook/dp/B004DI7R4W/

This would be the best late, late, late birthday present of all time if you could help.
The Tree of Enchantment

Tao Te Ching

Sikhism

Grimoire of Crowley

Angel Tech

The Upanishads

And any of the Vedas pretty, pretty please? Much and thanks!!! ALSO Your link of Angels, Demons by Lon Milo DuQuette is broken, I think.