I have the Black Rapid RS-7 for when I use 1 body and the DR-1 for when I'm lugging around 2 bodies. I really like them both and they are much better than the OEM straps.
That being said, I'm now looking at the Luma Labs Cinch as I like the fact that I can adjust the length on the fly and very quickly I might add. That way it is snug to your body when walking, hiking, etc, and then when you are ready to shoot you extend the length. Another plus is that it attaches to 2 points on your camera instead of just one on the Black Rapid.
Good luck on your search!