If you like a traditional carry-on roller I recommend Eagle Creek products. I was looking for one that was the lightest (tare) weight I could find. So many of the bags I found were heavier to begin with, and by the time my stuff was packed inside it was heavier than I like to haul around.
The Eagle Creek Adventure series is sturdy, lightweight, and is carry-on qualified in all airlines I have flown (> 30 trips/year). It is just over 7 pounds empty.
On a couple of occasions where I have had airlines hurt the bag (mostly breaking zipper pulls/zippers), Eagle Creek's lifetime warranty kicked in. I mail it to a local repair facility (mine is in NY) and it is back in a few days. I do have to cover shipping to get it there, but I have kept the box it came in and shipping is only a few bucks.