What to read after Orthodoxy?

Chesterton's characteristics would probably meet with the literary surprise of his life, when, after reading the plain, simple introduction, he would proceed to peruse the pages of Orthodoxy and find himself at once dazzled, perplexed, delighted by this blaze of wit, paradox, epigram, sarcasm, Johnsonian common sense, original ways of looking at things which everybody knows, deep philosophic argument served out in terms of the most commonplace thought, and some of the great truths of reliion tested effectively and favorably by inspecting them upside down. The book is meant to be a companion to Heretics, in which Chesterton attacked some of the current philosophies.