Nikon is showing the SB-910 on their web site for Sale ?????
They added the Radio triggering to the SB-5000 and I believe the trigger is built into those two cameras. The SB-5000 still does the CLS using the infrared signaling... You have to buy the Wt-something to add the radio trigger to any of the other Nikon cameras...
The SB-5000 is $600 and the trigger for the non-radio cameras is another $100ish...
Unless you have a reason to buy a new SB-910, and you want to continue using your external battery paks... I'd look at Nikon Refurb'd SB-910
Wayne may have a different take on this subject...