Ken Rockwell says:
This is Nikon's top flash as of 2016, replacing the old SB-910. The reason to get the SB-5000 is if you want radio control, otherwise the SB-700 does the same things with the same power.
Considering that the SB-700 is $399.95 at Teds, the SB-5000 might be worth it at this price.
JB and Harvey are selling the SB-5000 for $799. DigiDirect for $719, and Teds for $699.95.
CamelCamelCamel says it's the best price so far, and it's been like this since June!
Update: Gone to "Usually dispatched within 1 to 3 weeks."