Ha ha--you guys will probably just laugh and roll your eyes at this, but I've gone the fashionable route--I've been using this strap for the last five years:
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Obviously not my photo since it's on a Canon--just a screen shot from Amazon. It's attached to my D810 right now. Despite the fashion emphasis, it's surprisingly comfortable and durable. And cute, ha.
On my D600 I've got a freebie that I got from SmugMug--it's made out of that black rubbery material and is so comfortable, stretchy, and soft. Quite like it.
If I had more weddings and events planned to shoot this year, I think I'd try out one of those harnesses that lets you carry two cameras comfortably at once. The last wedding I shot I had both cameras on their own straps--a bit awkward but manageable.
I've never been comfortable advertising what camera I'm carrying, so I've always promptly disposed of the strap Nikon provides.
Have any of you tried a wrist strap? I think it would be impractical for many situations, but for something like a portrait shoot, I can see it being a good option. Been thinking about that for awhile...