Recommendations maybe. So far I've loved 1984, Fahrenheit 451 and Clockwork Orange. Brave new world was good too. Catch-22 still waiting in shelf.

+ I've been thinking of ordering;
http://en.wikipedia.org/wiki/We_%28novel%29

You should definitely read We. It is a tremendous book and the precursor to both Brave New World and 1984. Catch-22 is also amazing, but not so much of a dystopia book as a satire on the absurdity of war. If you like Catch-22, I'd recommend any of Victor Pelevin's books (Life of Insects and Oman Ra are my favorites). He's a modern Russian satirist in the vein of Heller.

I'll try to get some of Victor Pelevin, thanks, haven't heard of him before.
More suggestions are welcome.

Along the lines of Pelevin, I should have mentioned Bulgakov. Master and Margarita is one of the best satires of the 20th century. Koestler's Darkness at Noon is a great novel about being hauled off by the KGB during the purges. Death on the Installment Plan by Celine is also tremendous--about the breakdown of traditional French society (it's much more interesting, gritty, and funny--in a black humor vein--than that sounds). Naked Lunch and Cities of the Red Night by Burroughs are also worth a read, but they are a bit extreme.