Another pretty rare bag that is a good size is the Becket zip. It came in some really interesting colors.It's hard to beat a Willis for functionality and good looks. There's a reason they're so popular!
I think the Classic Hobo #9855 is somewhat rare. It's also pretty large, with a pocket on the front (not a gusseted pocket though) and a zip closure. It might have the same problem as the Taft: large interior space that swallows everything.

