I have an Osprey Kamber 42 with an insert. Mainly because it's rear opening. It's more comfortable than any Lowepro etc I've owned and tried. It's not as comfortable as the AG65 though! But I guess that's to be expected, the AG just wraps around you!
I also have an old Manfrotto Off Road? I think? It's more of a hiking bag, with a mesh back and a frame I think, but it's a side access one. Which I sometimes found fiddly depending on what gear I had.