I got you broseph. Two series, one dark fantasy and the other scifi.
I super-duper-highly recommend The Witcher series by Andrzej Sapkowski. So far, only three books are translated in English, but the rest of them have been translated by fans. The translations are very well-done, despite being riddled with very minor typos and grammatical errors. It's not enough to detract from the reading experience. If you're a fan of the games at all, then the books will simply blow your mind. The author considers the games to be an alternate version of Geralt's story, and doesn't at all consider them canon. But chronologically speaking, the games take place after the final novel.
Start off with The Last Wish. It's a collection of short stories designed to introduce Geralt and other important characters. After that, read Blood of Elves, the first novel, then Times of Contempt, which was recently translated. After that, Baptism of Fire, then Tower of Swallows, and finally Lady of the Lake. There's also another collection of short stories entitled Sword of Destiny, which you can read last. It bridges a few gaps and introduces a few new and interesting characters. It's not necessarily integral to the overall story, but it's a great read regardless.
Here's a link to the translations, in PDF format:
http://en.thewitcher.com/forum/index.php?/topic/20967-our-community-fan-translations/
Obviously these don't include The Last Wish or Blood of Elves since they're already translated officially. I personally recommend downloading the PDFs and using Foxit Reader to read them. If you aren't partial to reading e-books, I can understand. Sometimes it's just nice to have an actual book in your hands. Probably better for your eyes too...
I also recommend any of Larry Niven's dozen or so books that are part of his highly received Known Space universe. That includes all the Ringworld books (which Halo was inspired by, no doubt), Fleet of Worlds books, and the Man-Kzin Wars books . I've only read the first Ringworld book and I just recently purchased the first two books of the Fleet of Worlds series (which consists of five books alone). All of that will keep you PLENTY occupied with reading.
Of course, I wouldn't expect anyone but the most dedicated reader to be able to read a dozen books of the same universe without burning out. And it can be tough to bounce between two different series and maintain the flow. But there you go. That's damn near 20 really good books for you to read. Too much? Read just the Witcher books then. They're incredible. :0