People have said stuff I was gonna say so I'll say other stuff.
If you like fantasy, but not to whacky, I say
Fritz Leiber's Fafhrd & the Gray Mouser.
The greatest science fiction writer ever is Ray Bradburry. It doesn't matter if you write science fiction, because he doesn't so much write that as people fiction, if you know what I mean. It's good. Check out Something Wicked This Way Comes, Death is a Lonely Business or Green Shadows, White Whale.
The best adventure story I've ever read is Alexander Dumas's The Count of Monte Cristo. The books have always been beter than the movies, right back to the 19th century.
Some of the greatest popular modern fiction is written by Micheal Chriton. You've definatly seen some of the movies based on his books, Sphere(which is definatly worth reading, Jurassic Park, Andromena Strain(one of my favorites), The Terminal Man(another one of my favorites), and Eaters of the Dead AKA The 13th Warrior. They're all somewhat "guyish" but you'd probably like at least a few of them. The Terminal Man is actualy from the perspective of a lady-doctor. Timeline was alright and somewhat less spacy in some regards.
Burgess wrote some good but difficult-to-read books(probably owing to the fact he was a linguist), so check out that if you're interested, most notable being A Clockwork Orange. A more understandable and easily enjoyable book is One Hand Clapping, about a woman who's husband wins a quiz show and makes alot of money, and what happens to them afterwards.
Some "girl" classics(I've never read but 'everyone knows they're good or something')
Jane Austin - Emma, Pride and Prejudice, Sense and Sensibility
Louisa May Alcott - Little Women
Lucy Maud Montgomery - Anne of Green Gables and this that and the other thing.
Less girly but one of my favorites, Oscar Wilde's - The Portriat of Dorian Grey is a great book.
Other good authors - Nathaniel Hawthorne, Rudyard Kipling, Washington Irving, Robert Louis Stevenson...
That's all for now.