Although the seven that we own puts the grand total >$100, I love the Really Right Stuff B2-FABN clamp (
http://www.reallyrightstuff.com/B2-F...h-strap-bosses) for use with Black Rapid straps. We already had Arca-Swiss plates on nearly everything, and once I discovered the world of Black Rapid, I needed a way to keep a standard. B2-FABN to the rescue! I actually loc-tited the BR "Fasten'R" to the RRS B2-FABN, so I can ignore it and treat it as one unit. It's a little tricky switching from a non-collared lens to a collared lens and vice versa, but plates just stay where they belong, BR straps stay where they belong, and tripods/monopods/etc. all keep their standard clamps on top.
For a little while, before I was ready to cut the (neck strap) cord, I had a neck strap on a B2-FABN so I could at least quickly attach a neck strap. Unfortunately (or fortunately), this meant the camera hung at an unnatural angle, so they pretty much never got used.