I have had my Black Rapid RS-2 Sport strap for quite a while now, and I can honestly say that it is the best camera strap I have ever owned.
It is a great fit and very secure, I never worry about my D800 falling off. It combines an over the shoulder, with an under arm strap to make sure it is going to stay where you want it.
If you want to add a little storage for batteries, phone, biz cards, etc, you can purchase small storage pockets that can be added very easily.
All in all this strap goes every where my camera goes, I may not always need to wear it, but I will definitely have it ready to wear if needed.
If you’re interested in getting one, you can grab it at B&H where I got mine here. In my professional opinion, this strap is well worth the money.