auto ISO???? never. take control of your images. and shoot as slow as you are comfortable with
I see a lot of responses denigrating some of automatic controls that can be found on modern consumer and professional camera bodies. These are tools to be used. Being 'in control' does not mean always shooting manual, it means learning how your tools work and when to use them appropriately.
There is absolutely nothing wrong in using aperture priority, shutter priority, auto iso or even variable program. All of these have a particular function and operate in very predictable manners, the trick is to learn when and how to use them. Telling all and sundry that 'shooting in manual' is the only way to go is not an indication of greater skill and understanding but of a misunderstanding of the full gamete of the possibilities in controlling the camera.
As for using auto iso with a d700. The camera is near the pinnacle of technology, there is no reason to not make your task a little easier by tapping into its capabilities. The 70-200 VR-II can be used handheld down to about 1/30 sec with care. So, with auto ISO limit the lower shutter speed to what is comfortable, limit iso to a max of 3200 or 6400 (there might be some noise but that is better than no image at all), set shooting iso to about 1600 for d700, shoot in aperture priority to control your depth of field, shoot as wide as possible while having enough dof for the scene, set your high iso noise reduction appropriately, watch your histogram and adjust ec as needed for the first few shots. For any set aperture the d700 will shoot at selected iso and reduce shutter speed until the lower limit is reached at which point it will start to increase iso past the shooting iso. Set your auto exposure increments in 1/3 stops. As long as you have some light to work with the camera will perform. Expend your energy on the creative framing of images and in setting scenes as required. Set the camera up appropriately and let it do its job.
Try it at home a few times to see how it goes.