Should I keep old Tokina lenses when purchasing a Nikon D600?

I currently have a Nikon D7000 with six lenses.  Two of these are fairly old Tokina ATX lenses that I had from my 35mm film days; they are obviously full-format lenses.  One is a 28-70 mm f/2.8 constant aperture.  The other is an 80-200 f/2.8 constant aperture.  They seem to perform very well, but am wondering whether I should try to sell them when I purchase a Nikon D600 and go full-format.  My other 4 lenses are all DX format, and I will continue to use these on my D7000.  Does anyone have any knowledge of these Tokina lenses and how good they are?