For years I have used two-ring European-style binders from Leitz simply because it was very difficult to find a quality binder sized for US standard paper (8-1/2″ x 11″). However, I recently switched to Naked Binders, and I find them remarkably well made and thought out.
Unlike the readily available, poorly made, vinyl binder with the covers only bonded at the seams, the paper and book cloth covers on these are fully bonded to the board underneath. The result is that a minor tear does not cause the whole thing to fall apart, and they feel like they are built to last. The D-rings are attached to the back cover rather than the spine so the pages lie flat and index tabs line up making a neat and clean presentation.
The fact that they are environmentally responsible and made in the USA are bonuses. I bought a couple as a test case and quickly ordered more to replace all the binders in my home and office.