The most recommended title was The Lightning Thief (or the Percy Jackson series as a whole)!
Gavir in Powers by Ursula K. Leguin. Won the Nebula Award for best fantasy. Excellent.
The Hobbit? Perfect for 7th grade!
Dragons of Darkness by Antonioa Michaelis, and it is replete with themes, plot, characterization, and the epic quest.
The Alchemyst by Michael Scott
Epic / Conor Kostick. On New Earth, a world based on a video role-playing game, fourteen-year-old Erik persuades his friends to aid him in some unusual gambits in order to save Erik's father from exile and safeguard the futures of each of their families.
Seeker by William Nicholson
Eragon Series by Paolini
The Extraordinary Adventures of Alfred Kropp by Richard Yancey, an Arthurian/Excalibur story.
Beastly. A wonderful story line.
Pendragon series,
Keys to the Kingdom,
Charlies Bone,
Fairy Wars the Fairy Lord,
The Windsinger trilogy,
Eragon and the rest of the Inheritance cycle,
the Iron Ring,
the Door Within trilogy
Great Tree of Avalon books are an epic journey
The Ancient One by T.A. Barron
The Hero's Trail which talks about all the different kinds of heroes.
Hunger Games series by Suzanne Collins. I think it would fulfill the epic quest requirement and it's completely engrossing. Third book comes out in August (woohoo!)