HELP: Great Sci/Fi & Fantasy Titles Needed

On a bit of a kick these days, and I need your help to keep it going. I've been reading a lot of sci fi/fantasy novels lately and I want to find some more this afternoon.

I recently devoured the Hunger Games trilogy, and naturally anything that gripping and fast-paced, the kind to inspire all-night reading, would be ideal. I also did the City of Ember books, which were torn through at a similar pace though with less fervor. And Michael Chabon's fantastic (as if his writing needed complimentary descriptive terms anymore) Summerland novel.

Granted most of these are pretty firmly placed in the Young Adult category, but I have no problem with that. Some of the best stories are, and I am in fact trying to learn some fundamentals about how to write these stories.

A couple wider attempts have failed; I stalled pretty early on in Robert Jordan's Eye of the World. I was also more of CS Lewis guy than a Tolkien one (Ballet over Opera, Crunchy over Creamy) and Jordan's dense mythology and languages and worlds whittled away at my interest about a third of the way (much like Lord of the Rings.)

So with all that information, and with the revelation of other all-time favorites--Narnia, Lewis' Space Trilogy, LeGuin (Earthsea), Orson Scott Card (Ender AND Maker,) Roald Dahl, etc.---does anyone have any choice suggestions?

Any recommendations would be hugely appreciated. Thanks.