Gibson is always worth a look. For my money, the Bridge trilogy (starting with Virtual Light) is even better than the Sprawl books - a bit better organised, and a bit more tightly plotted. I also think that Pattern Recognition, despite being set in 2002, is basically a cyberpunk novel. Gibson is on record as saying that we live in a science-fiction story now - the only question is whether or not it's a dystopia.
For something more contemporary, Peter Watts' Starfish is dark, brooding, well-written and available for free! Find it on his website: http://www.rifters.com/real/STARFISH.htm