I use a SB600 and a SB900. I tried a SB700 briefly and it's good well worth the price, and I'll probably get a couple one of these days as a secondary fill light. If it was out when I got my SB900, I probably would have went that way.
I believe some variants of the Metz does work with the CLS and iTTL (which is very different from TTL) and I don't know of any others - not to say others don't have it. A few others with Orangebox just use some strobes as basically Studio strobes and probably meter etc, manually. From what you say you shoot, That has never sounded quite like you so I would stick with Nikon.
Nikon's flash system is so good, I just don't chance it with 3rd party flashes. If all you want is a single flash the SB700 is a no brainer.
Gary Fong - I have the collapsible "pro" kit - I think it was $150? That doesn't have sizes and I like it much better than the "hard" versions. It came with the grid spot which is "hard" (and really fun to shoot with) but the thing constantly gets knocked off. The collapsible one is rubber and grabs the flash tight. I have shot all day at events bumping into everything and it never falls off.