okay, if you want fiction…
I say any of George Orwell’s fiction.
as well, an earlier book named We by Yevgeny Zamyatin has a similar theme to Rand’s work, though I haven’t read it (I also haven’t read her fiction… have read a tiny bit of her nonfiction). no one has really written books like Rand’s, though.
you also might like Heinlein, though. similarly into the rugged man philosophizing style. though I haven’t read a lot by him, he gets more preachy (which I suppose you like) in his later stuff.
The DIspossessed by Ursula Le Guin deals with the varying merits of different cultures as represented by different Earth colonies. (I found it silly to imagine one culture per planet, though, even with that justification.)
the former book contrasts an individualistic capitalist culture versus a collectivist anarchist one. I find both societies more than a little cartoonish (not in contrast to other novels, but in contrast to real life). it comes down on the side of the latter culture, definitely.