Book I am going to buy

Ok, so I am finishing House of Leaves at the moment, and considering some other books.  here's what I have confirmed for Brawl:

Brave new World
Pale Blue Dot

I am considering:

The God Delusion (Sounds like it could be very biased, even considering the title)
Lord of the Flies (Sounds like a unique concept, but from the sound of it seems like almost a childrens' book).

Any other suggestions?

Well, seeing how you've never read Brave New World or Lord Of The Flies, I'm going to assume you haven't read many books and I am going to recommend you books based on this assumption. Consider reading the following (in no particular order):

John Steinbeck - Of Mice And Men
John Steinbeck - The Grapes Of Wratch
F. Scott Fitzgerald - The Great Gatsby
Fyodor Dostoevsky - Crime And Punishment
Albert Camus - The Stranger
Isaac Asimov - I, Robot
Herman Melville - Moby Dick
Charles Bukowski - Post Office
Charles Bukowski - Ham On Rye
Charles Bukowski - Pleasures Of The Damned: Poems, 1951-1993
Richard Matheson - I Am Legend
James Joyce - Ulysses
Stephen King - The Shining
Stephen King - Cujo
Stephen King - Pet Sematary
Stephen King - Misery
Ernest Hemingway - The Complete Short Stories Of Ernest Hemingway
Ernest Hemingway - A Farewell To Arms
Ernest Hemingway - The Sun Also Rises
J.D. Salinger - Catcher In The Rye
J.D. Salinger - Nine Stories
Nadine Gordimer - Jump And Other Short Stories
David Means - The Secret Goldfish
John Knowles - A Separate Peace
Ayn Rand - Anthem
Ayn Rand - The Fountainhead
Mark Twain - The Adventures Of Huckleberry Finn
Mark Twain - The Adventures Of Tom Sawyer
Anne Frank - Diary Of A Young Girl
Kurt Vonnegut - Slaughterhouse-Five
Kurt Vonnegut - Breakfast Of Champions
Kurt Vonnegut - Cat's Cradle
Hunter S. Thompson - Fear And Loathing In Las Vegas
Tom Robbins - Jitterbug Perfume
Jack Kerouac - On The Road
George Orwell - 1984
Cormac McCarthy - The Road
Ralph Ellison - Invisible Man
H.G. Wells - The Island Of Dr. Moreau
Vladimir Nabokov - Lolita
William Faulkner - As I Lay Dying
William Faulker - The Sound And The Fury
Gabriel Garcia Marquez - Collected Stories
Thom Jones - The Pugilist At Rest: Stoires
Chuck Palahniuk - Fight Club
Chuck Palahniuk - Haunted