Whatever bags you do get (and I'd add Arkel to this mix - check it out), make sure that you are good with the placement vis a vis your heels. If you are looking at Tubus racks, I'd recommend NOT buying any of them that are designated "evo". These racks are not compatible with the extension kit that allows you to move the rack up one inch and back one inch. You'll likely need this if your bike has short chainstays or you have big (as in normal) sized feet. Their skewer based racks, normally used for disc brakes do essentially the same thing but are pretty futzy if you have to change a tire.
J.