I have to say though, it makes me a little grumpy that the kindle versions of some books are more expensive than the paperback. How does that make any sense? Then when there's the public library and Half Price Books it gets hard to justify. I can get a paperback copy of American Gods for $8 from Amazon, or the $10 Kindle version . . . I don't expect them to match the used price, $3 from HPB, but shouldn't it be no more than the paperback? Or even less?
Can't blame you there. Considering that the expenses for making an ebook are nowhere near those for producing a printed book, there's no way I could justify to myself buying an ereader. (I'm a cheap SOB) I'll keep my printed book library for the foreseeable future. (besides, I have some nice, collectable, 1st editions in there)
Asimov is one of my favorite authors, so most anything by him (never read any of his westerns or detective novels though) is a good read IMHO. A lot of his books also tie in to his Foundation series. Particularly the assorted robot novels. (Think of those as prequels.)
Anne McCaffrey is best known for her Dragonriders of Pern series.
Orson Scott Card"s Ender series or The Tales of Alvin Maker series are good
Jack Chalker's Quintara Marathon or Soulrider quadrilogies
C.J. Cherryh - most anything
Arthur C. Clark - Another of the "most anything is good" authors. The 2001 saga, & the Rama series are favorites
Gorden R. Dickson's Childe Cycle
Terry Goodkind's Sword of Truth series was a much better read than the TV show based off of them. (go figure)
Ursula K. LeGuin - Earthsea series (the TV miniseries pales in comparison)
Harry Harrison's Stainless Steel Rat series. Because they're amusing, over the top, escapism.
Katherine Kurtz She has a few interconnected series dealing with a race called the Deryni. medieval fantasy
Julian May - The Galactic Milieu series
Larry Niven - most anything
Margaret Weis - most anything
Roger Zelazny - Chronicles of Amber
There is also a 4 book set put out by the SciFi book club that is a compendium of the various thieve's world novels edited by Robert Lynn Asprin. Basically he takes all the novels (written by many different authors) and puts the chapters into something reasonably close to chronological order. Authors include Robert Asprin, Janet Morris, Poul Anderson, Lynn Abbey, Marion Zimmer Bradley, Andrew J. Offut. The omnibus volumes are titled Sanctuary, Crosscurrents, The Shattered Sphere, and The Price of Victory. They are unfortunately long out of print, but can be found in the occasional library or at online used book sellers.
http://www.bookcloseouts.com/ often has some really good sales on new books. (A few months ago they had a $1.99 fiction sale. Damn but that hurt the checkbook.

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And if any of you has a collection such as myself, this is an excellent program for cataloging your books. (also has music and movie versions)
http://www.readerware.com/And Baen (A large scifi publishing house) offers some free ebooks.
http://www.baen.com/library/