As Greg says, if one can only have one telescope the 12" F3.8 is very versatile, not to mention affordable, compared to a 16"/17" CDK/RC and 0.84"/pix image scale is certainly adequate for many applications, but about half that would be great to take better advantage of the more consistently good seeing up here and increase the sampling for traditional deconvolution to work its magic. To have optics free of astigmatism would help too
..probably lift the resolution a similar order of magnitude again that the improved seeing has
Mike