I use the BOS Strap (sliding strap) priced at about $60. The strap is attached to the strap holder on the left side of the camera and not to the tripod screw hole. This allows the quick release to remain on the camera. It also allows the camera to hang at good position on your hip with the lens pointed downward and allows one to get to shooting position quickly. I believe theweb site is www.bosstrap.com.
The 1.5" strap is comfortable for hours of shooting.
If you insert your right elbow in the strap to stretch it, you can pull the left side of the strap to the left side of the camera and obtain a very good position for hand held shooting. This goes against placing your left hand under the lens but some may find it worth while. It works much better with Auto focus lenses.
Thanks.