I'm a total bibliophile- I'll read pretty much anything, but I only collect the most noteworthy (to me) books. There's three living authors who could sell me their grocery lists:
Stephenson; the only thing of is I didn't really care for was The Big U. Everything else is beautiful, especially his Baroque Cycle.
Tim Powers, particularly the Last Call/Expiration Date/Earthquake Weather semi-series. He also has a knack for taking little factoids out of history and weaving a perfectly entertaining and almost plausible explanation for them...
James Ellroy of LA Confidential fame. All his "LA Quartet" and later books are totally bent and totally compelling.
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If you like swords-and-sorcery, see if you can chase down any of Karl Edward Wagner's Kane books. The protagonist is anything but a hero, but the stories are great.
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On a completely different note, The Story of O and Carrie's Story/Safe Word are the most-often borrowed of our books.