Personally, I feel that the issue of digital noise is way overblown by pixel peepers and the great enlargers. I switched from dx to fx for low light photography...a D700 to be exact. I have been quite satIIsfied with the D700. You simply cannot beat larger photon recptors. I looked at your shots in this post, and I would be more concerned about focus than noise. Take my 2 cents for what it is worth as I neither sell my photos nor do I blow them up to billboard size.