For full rack, the Racktime Addit. It's lighter and cheaper than the Tubus chrome moly racks but you can add a rack top pack like the Arkel Tailrider (there is a new version coming out next year that has expandable panniers).

http://racktime.com/en/rear-carriers/addit



Or, if you can get away without panniers, then the Arkel Randonneur rack. They also will have a new backpack at 2200 cubic inches that will slide onto this rack. That could be a way to carry a fair amount of stuff without panniers.

http://www.arkel-od.com/us/all-categ...neur-rack.html



As far as photography goes, I use my Arkel Tailrider for that. It will take my prosumer body (Canon 40D) and a 70-200 on board no sweat. Would probably also take my pro body (1Dmk3 but haven't tried it).

Here's the link to Arkel's 2012 catalog. Some really interesting stuff in there.

J.