If you are a big sci-fi fan I would suggest Iain M Banks, Alastair Reynolds, Dan Simmons, Peter F Hamilton, and Ken MacLeod. They aren't always as well known. But superb authors.
Banks speculative fiction is amazing as well.
I have definitely heard of Iain Banks, not completely sure about the others. Was getting into Rudy Rucker and Greg Bear, but they are both pretty dense reads. Very good, but you almost need a degree in physics to absorb some of their concepts
I need to get back into reading Ken MacLeod; I read "The Fall Revolution" series, but I think Y2K intervened and I cut back seriously on my reading. 3:O|>
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Banks speculative fiction is amazing as well.