After his record setting kickstarter, I read The Final Empire... boy I didn't realize that my reading list was going to be overtaken by Sanderson books for the next 18 months as a caught up on the Cosmere stories. I've only got a couple more and then I can finally read some other authors! XD
For classics I loved The Day of the Triffids, Planet of the Apes was pretty good too. Slaughterhouse Five was an absolute all-time classic. For modern stuff The Expanse series was absolutely awesome if you haven't picked that up yet.
If it is the computer and algorithm stuff that draws you to Liu Cixin and Egan, maybe you'd like Neal Stephenson. Cryptonomicon and Reamde are not sci-fi, but feature interesting computer topics.