I enjoyed the Red/Black/White trilogy by Ted Dekker. Perhaps more fantasy that pure sci-fi and also has religious overtones so if your hostile towards that kinds of stuff you might not like it.
I'm listening to a Dresden Files book right now, Small Favor, this is for sure more fantasy than sci-fi, but halfway through and it's pretty entertaining.
And if you enjoy watersports or stories of the high sea you MUST try out The Proving Ground. It's a true recounting of the 1998 Sydney to Hobart ocean sailboat race. Unexpectedly a hurricane blows up in the middle of the race and it turns into a fight for survival that not everyone wins. Probably the most entertaining audio book to which I've ever listened.