Obviously the choices are limited by the matter of matching "old" lenses with a sensor having a resolving power which should not kill the lens own one.
The A7r, D800 and M typ 240 should get off the list.
With MF Nikkors, a 12~16MP FF sensor is nice (correct pixel density so that the lenses aren't producing muddy images). Over this megapixels count, you'll be disappointed with the results.
So the actual choices are : Canon 5D (original one), Nikon D700, Nikon D3 and D4, Nikon DF. Still "a few", but not many.
If you buy new, you may choose between the D4 and DF only.