
Roswell, US
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What's your budget? If you only want to buy new flashes and can spend $400-500 on a single flash, get an SB910. If you only want to buy new flashes and can only afford $300-400, get an SB700.
If used flashes are an option for you, my favorite flash is the SB800. It has all the off-camera, advanced wireless capabilities of the newer SB910 and is more powerful. It only lacks some of the more intuitive external control of the SB910, the ability to update its firmware, the rigid filterset and the ability to zoom out to 200mm. None of those capabilities of the SB910, though, have ever induced me even slightly to consider upgrading my SB800s.
Essentially - a used SB800 gets you all of the key capabilities of the SB910 (wireless master and remote capabilities in Nikon's advanced wireless lighting, PC Sync connector, optical slave sensor, highest GN of any of Nikon's flashes in the last 5-10 years, control of three indepenent remote groups when acting as commander, Auto FP high-speed sync, repeating strobe, modeling light, blah, blah, blah). Dollar for dollar, I think a good quality, used SB800 is the best deal on a nikon flash that you can get. KEH.com is good about giving very accurate ratings on their used products. If you buy LN, EX+ or EX from them, you're getting a top-quality product, for sure.
And - by the way - all of the cameras you mentioned in your post are fully compatible with all of capabilities of the flashes I mentioned in my post. That is, of course, except for the D400...which hasn't been released. If it ever is, though, I assume it will carry forward the same flash-compatibility of it's predecessor, the D300 which has essentially the same flash-control capabilities as the D80, D200 and D7000.
Good Luck, Ben Visit my Nikonians gallery.
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