C.S. Lewis also has some VERY thought provoking Christian literature.
Silver

Dee Henderson writes a couple of different series - they are more on the romance side, but it's very "light" and you're also caught up in the mystery/adventure aspects as well. There's the True Heros series (deals with the military and other service organizations such as the CIA and FBI) and The O'Malley series (follows a family who's "adopted" themselves and their relationships with one another and the people they get involved with)

I mainly read the romantic suspense type, and other great Christian authors are Terri Blackstock (her Newspointe 911 series is pretty good) and Colleen Coble (I've only read the first book in her series, but it was a really great read!)

books for kids that are not trashy:

they may not be "christian" but appropriate for kids:

anything by beverly clearly,
babysitters club series,
Sweet Valley Twins ( its when they are in junior high and very kid oriented)

If you meant adult books, humm not really sure. Most stuff i read has at least a little bit that is trashy, but i try to only read things that are somewhat (or only minor) trashy. Of course not intentional, but if there is a few curse words in a otherwise good book i don't really care. But i am sure going to a local christian store you could find books that are of approprite un-trashyness, or they could tell you where in your area you could find books. I mean maybe there are a book store or two in your area that would specialise in "clean" books.

Agreed. In fact, after posting in this thread last week, I went and pulled it out again. It really is one of the best books I know of, and one that always engages me on a spiritual level.