I went with a Kata R-103 - these are not made anymore, but can be found. I got a great deal on a new one on Ebay, and added a W-94 Waist Pack that attaches to the backpack for when I want to haul more gear. This is perfect for me - sometimes I want compact and lighter, sometimes need to haul more, and it has a great tripod holding system as well. This is the best backpack that I have ever seen for protection and comfort - and it is really well made. Worth the hunt to track them down... Not sure why Kata changed their designs so much, these are absolutely perfect.
W-94 Waist pack