Upload & Sell: Off
For lightweight non-guided tracking mount good for lenses up to 200mm I would suggest to start with basic Astrotrac setup - TT320X Astrotrac (+ battry pack and polar finder), Manfrotto Junior 410 geared head for polar axis, any decent ballhead for camera and Manfrotto 055 class tripod. I was able to take very good wide-angle pictures with the setup similar to that.
As for the D800. There is another negative aspect about it - insanely huge files. Astrophoto workflow is very image processing depanding. You want to increase signal to noise ratio to get black black, remove amp-noise, hot-pixels that will inevitably appear during long exposures. For me astrophoto workflow means capturing 15x light frames, 15x dark frames, 15x flat-fields and 15x offset files, converting all of these to FITS files, then averaging, subtracting, stacking, demosaicing to 16bit TIFF files (each is more than 72MB from 12mp camera), then post-processing etc. I have a solid quad-core computer but even that struggles a lot when processing files from 12 megapixel camera. I can only imagine what would happen if I attempted to process 36 megapixel files from D800. It could well take several hours even on a state-of-art computer...