Heh, I love the Sweet Valley books!! I've read almost all of them!
I have a lot of favorites, I'll make as short a list as possible.

-Almost all of Michael Crichton's stuff, although my favs are Jurassic Park,
Timeline, and Sphere (The Andromeda Strain was also good, but it scared
the crap outta me!)
-Relic by Douglas Preston and Lincoln Child
-Any of Stephen King's short stories
-The Lord of the Rings Trilogy by JRR Tolkien
-Vertical Run by Joseph R. Garber
-Watchers by Dean Koontz (Ticktock was another one I liked by him)
-Around the World in 80 days by Jules Verne
-Farenheit 451 by Ray Bradbury