I would recommend getting a D700, if you don't care about shooting 1080p24 video. An FX sensor will be more light-sensitive with a lower noise floor than its DX counterpart. Not all noise tests are as revealing as they could be. Real-world tests will show a significant, discernable amount of noise in DX images, even at ISOs as low as 100, under trying circumstances (dusk, magic hour, or low-light shooting with lots of chroma in the frame).
From my initial tests, the D7000 appears about as noisy as my D90 (and I think my D90 is fairly noisy). In fact, the noise level in my D90 made me swear I'd never buy another DX body, but I wanted to benefit from the improved video capability of the D7000 now. Though I don't own a D700, from what I've read elsewhere, it appears to be about a stop faster than a D7000, with a visibly lower noise floor.
Increased speed, lower noise, and greater dynamic range are going to be greater contributing factors to achieving improved image quality with the D700's FX sensor, more so, than say, than just the higher megapixel-count of the newer D7000's sensor. If you want to shoot video, get the D7000, or wait for the D800 next year. If you're only concerned with stills, then I would lobby for you getting a D700, or wait for its successor sometime next spring (hopefully).