If you're looking for space war, detailed descriptions of future technology and some action-horror, then Peter F Hamilton's Nights Dawn Trilogy would be something to look at. Also, maybe Jack Campbell's Lost Fleet series (it's a long-retreat story, and compared to PFH they're shorter books). John Scalzi's Old Man's War has some interesting ideas, although their execution is not to my taste but it could be to yours and, if so, there's 5 books or so in the series.
Don't know whether you've already read them or not.