Along with the Westminster Bookstore (WTS) discount on Michael Horton's The Christian Faith, you may also want to keep in mind Christian Book Distributor's 50% discount . [As of 1/31/11 the CBD price is now at a 40% discount.]
I'm working up my order and am looking forward to using Horton's book in my seminary studies.
The Christian Faith: A Systematic Theology for Pilgrims on the Way
Zondervan / 2010 / Hardcover
Availability: Available to ship on or about 01/21/11.
CBD Stock No: WW286042
Save: $25/00 (50%)
Also, recommended by my dad, is Horton's The Gospel-Driven Life. We found a copy of this book during the Thanksgiving holiday and he bought it. Since then, he shared a few highlights with me as he worked his way through it. He liked it so much that he immediately looked for another Horton title to read. My dad is a very particular reader. He's not interested in anything that presents a watered-down gospel, nor an overly academic, heady gospel. He delights in the biblical, simple, palatable, life-changing kind of gospel. That's the gist of his description of Horton's book.