John Scalzi is a good combination of action with some neat high-concept ideas thrown in to the bargain. Vernor Vinge can achieve this as well. I also rather like the Culture books by Iam M. Banks. (I recommend starting with Player of Games.)
Typo: should be "Iain M Banks"
I also enjoy his culture novels. His non-culture "Against a Dark Background" is also excellent.
If there is another Stephenson book you have been thinking about reading, I would recommend diving in. I haven't read all of them, but I've read many, and have yet to be disappointed. Also check out Daniel Suarez if not familiar with him already. HTH.