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Do you actually want to put the speedlight on top of your camera with TTL, if you see yourself doing this then go for the SB-910 because you will eventually meet the shortcomings of the SB-700. Don't get me wrong, i have one and love it but you can never have enough juice, at least with a SB-910 you can dial down.
If on the other hand you just want wireless CLS compatibility, check out the newer Yongnuo EX flashes, they support wireless CLS and manual only, they are only 40% more than the cheapy manual only base model, no on camera TTL.
Hope it helps.