For binding posts, the best quality I've seen are from Superior Electric. I particularly like the hex style. Allied Electronics and Newark stock them, but neither Mouser nor DigiKey. One line of Superior Electric binding posts are of the style used in late HP or current Agilent products; body of the binding post is gray with a colored ring for ID.
These are not cheap, but are high quality. The 30 amp rated ones are extremely expensive, but the smaller current versions are within reach if you want a nice looking and performing binding post.