Tough decision. Depends on your shooting style. I tend to be a deliberative shooter being used to MF and Polaroid pack cameras so, I've vote for the Rolleiflex and the Contaflex. The Contaflex is a joy to use and the lenses for it are excellent. Do you have a complete lens set for it? They are not all that expensive and very usable. The Rolleiflex is a no brainer though the 'Cord is lighter if it makes a difference. The F3 for me would be too heavy and bulky.