Last year with the D700 in mind I started a thread in the Straps Forum, I was amazed by the response, many very comprehensive replies.
Now I have three extra straps, A Crumpler Singapore which is excellent with a large outfit and has one hand adjustable sliders and so very easy to change to sling type configuration and very comfortable.
An Optech USA looks like a piece of sponge cut with the kitchen scissors but a brilliant strap has a grippy and cushion effect on the shoulder. I like this one best for ease of use its not at all bulky and the only non Nikon one I have which can be housed easily in any of my bags including the new large Think Tank to leave only the bag strap showing.
A Sun Sniper which went back into its box after a first glance, so big and bulky especially with the extra hardware clip etc didnt think I would ever get on with it as I like to travel light and as unobtrusive as possible. However I recently became the proud owner of a Nikon 70-200 2.8 VRII so maybe the Sun Sniper will get used attached to the lens socket.