game, the 75mm SA's sometimes sell for very reasonable prices on Ebay, I paid 200 euros for one last year from Italy. It was described as mint, in fact it was new and had never been used.
There's been quite a bit of discussion on APUG about 65mm lenses on 5x4 you could try a search, some people like them for 5x4 others don't. The major downside is the very tight image circle, I tend to only use front tilt so that's no problem, but I have to use back tilt as well as front tilt & rise to prevent the front of the focus track on my Wista getting in the frame, sounds harder than it is in practice.
The 75mm is an excellent lens, handles shooting into the light extremely well and is razor sharp. Used alongside an otherwise excellent zoom on a 35mm recently the zoom flared the 75mm SA images are perfect, that was shooting into the sun.
Ian