Personally, I'm still a big fan of the classics.....Clarke and Asimov are 2 of the main authors i follow....

Asimov's original Foundation Trilogy was a classic and it was so awesome at the end
In terms of pure enjoyment, I prefer all the short stories that they wrote....the Robot stories from Asimov and the random short stories from Clarke...I still like the collection from Clarke called Tales from the White Hart (if I'm not mistaken) and it's main character Harry Purvis