Well.. I 'invested' in an RB67 after my 'retirement' thinking it 'might' be lighter to humph around than my 4x5..(or 8x10 B&J)...was I ever wrong. I soon found found that I 'missed' the benefits of a 4x5 (swings, tilts, and 'shifts') 'front and back' as well as the amount of 'information' recorded to film on each and every exposure . (the RB has not been out the house for some 3 years)
what a difference 3 1/2 years makes. I have a pro S in pretty good condition that I love. Decided I should get another body to have some spare parts if needed. That idea turned into "I should just get an SD in really nice condition" Still looking for the right deal.
Recently went through a similar process with my Toyo 45E which is now my backup to a 45G