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Because the D800 is full frame, I think you should seriously consider an alternative camera with a smaller sensor - either a CCD or a DSLR with an APS-C crop sensor. The reason being that most telescopes are not designed for imaging with a full frame sensor - the "corrected field" of most flatteners / coma correctors is only up to APS-C, meaning that beyond this the image will not be properly corrected for coma, spherical aberation etc. Furthermore a 2" focuser is too narrow for a full frame sensor, and will result in significant vignetting (as Stuart mentioned above).
I am fairly sure that none of the correctors available for a SCT will provide a corrected, unvignetted image if used with a Full Frame camera. Telescopes which are available locally which accomodate full frame are refractors like takahashi FSQ/TOA. Televue 101is, or the Orion Optics AG newtonians. These are all VERY expensive. However if you can go with a crop sensor, your options will expand considerably - ED80, newtonians with a Baader MPCC corrector, SCT scopes etc.
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