What format do you shoot most (or are likely to adopt in the future?) If you shoot mostly 35mm and some 2 1/4 x 2 1/4, get a good, 6 element 80 mm and use it for both. It will somewhat limit the size of enlargement for 35mm, but you'll also be using the sharper, center portion of the lens.
If you shoot a lot of 2 1/4 x 2 1/4, get a good, 6 element 105mm. Again, the longer than 'normal' focal length lens will limit your size of enlargement a bit, but you'll be using the center of the lens.
I favor Rodagons, but a Componon-S or El-Nikkor will be comparable.