I read Fahrenheit 451 the summer after sixth grade, and was so fascinated that I read it all in one sitting, then read it a second time of the course of the next few days. It’s a great book for that age.
I am already How the Grinch Stole Christmas, and so is my mother. My sister and I loved that book. My mother can also still do Ted and Fred word-perfect from memory, even though I’m now 27 and my sister’s 24.
The Liner notes to Highway 61 Revisited
I think I already am Cannery Row (Stienbeck), Gaudy Night (Sayers), and Neuromancer (Gibson) so I think the next book would be Cyrano de Bergerac (Rostand) unless plays don’t count, then I would be Age of Innocence (Wharton).
The amusing thing is that nobody wants to be Farenheit 451.
You missed the 3rd post. 
Since Neuromancer and all the really important ones like 1984 are taken, I’d have to be either Citizen Of The Galaxy or Starship Troopers by Heinlein, or else the entire Hobbit/Lord Of The Rings collection.
I hope my memory would be up to it.
The Long Dark Tea-Time of the Soul
I would be The Fireman’s Manual on How to Burn Books, With Handy Companion Texts for Trials and Demonstrations So That You Don’t Need To Burn Me for Practice.
Second choice would probably be The Collected Works of Fyodor Dostoyevsky
The Grapes of Wrath. I hope nobody said that already.
The Bell Jar by Sylvia Plath, maybe…
I’d like to say The Lord of the Rings (Tolkien), I really would (mainly because people in my family would lynch me if they read this thread and knew I didn’t :D), but I’ll have to go for either The Martian Chronicles, S is for Space, R is for Rocket (all Bradbury), or I, Robot (Asimov). The October Country and Dandelion Wine (both Bradbury) would be farther down my list. Those books made an impression on me growing up, the emotionalism of Bradbury and the rationalism of Asmiov, and I couldn’t bear to lose them. They can have my memories when they grep my cold, dead brain! 
the Earth’s Children series, by Jean M. Auel, or maybe The Eyes of the Dragon by Stephen King. those are my favorite series and favorite book, respectively.
oh yeah, and i think being in Xanth (whatever the series is called, by Piers Anthony) would be fun… wonder what my talent is
The Odyssey by Homer (not in the original, though, I’ll leave that for someone else :D)
I would be Candide and To Kill A Mockingbird.
Iain Bank’s “The Crowroad” – but I will have to work on my Scots accent.
The Gulag Archipelago or maybe The Kalevela.
I’d be The Great Gatsby and Tender is the Night.
Green Eggs and Ham
Your first title reminds me: One Day in the Life of Ivan Denisovich (Alexander Solzhenitsyn, also the author of The Gulag Archipelago). I read that book once and loved it. I’ll have to get around to reading Archipelago, too.
I’d shoot for the complete works of Lewis Carroll. Already have most of the poems down.
But Farenheit 451 could never happen these days. Heck, there would have to be stuff like TV shows that showed wanted criminals in prime time, and encouraged citizens to turn them in…
Um… I’m gonna go read.
Beowulf or the Canterbury Tales