Did anyone mention Asimov's Foundation Trilogy? There you have a good plot with a strange society creating a Universal Utopia.
Two examples from Ursula Leguin:
The Left Hand of Darkness as an example of a society which has no sexism.(also a great love story)
The Dispossessed for an anarchist society as utopia.
Going back into the early days of science fiction:
WE by Yvegeny Zamatyin. An early totalitarian utopia and one of Orwells principal influences for 1984.
Left Hand of Darkness is a great read, probably the best sci-fi I have read.
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