For all that I love the Robot novels, if you only want one Asimov novel, I'm rather partial to THE END OF ETERNITY.
http://www.amazon.com/gp/product/B00...NFCGZNT5PXHQ5D
It is an oft-neglected companion to the entire Robots/Galactic Empire/Foundation timeline.
Quote:
Review
Praise for The End of Eternity:
“His most effective piece of work. Asimov’s exemplary clarity in plotting is precisely suited to the material at hand. Asimov’s engagement with the present is clearer here than in his other works, as is his engagement with the human.”
--Locus
“By literary standards, this tale of time travel from the 95th century is generally rated Asimov’s best.”
--Entertainment Weekly
“Asimov’s flirtation with the tropes employed by A. E. van Vogt and Charles Harness is startling for an author deemed ultra-rational and scientific.… The effects of this influential, seminal book echo to the present, in the works of such writers as Greg Egan, John Varley, Kage Baker, and Greg Bear.”
--SciFi.com
Product Description
One of Isaac Asimov’s SF masterpieces, this stand-alone novel is a monument of the flowering of SF in the twentieth century. It is widely regarded as Asimov’s single best SF novel.
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Or, for a standalone, THE GODS THEMSELVES. (no ebook, though.)
For all his humans-only stories, Asimov's first all-out attempt at aliens was pretty darn good.