An 80-90 year old 5x7 would be nice. I got rid of my Shen Hao 4x5... found it too small and too fussy. I don't (NEED TO) use all the movements it had to offer. I like the 5x7 size with it's somewhat novel size and extremely large size, yet easy to cary (Seneca City View).
THe 80 year old lenses are plentiful easy to service and can be had cheap (for B+W) work.