I am trying to find a breeder of what would now be considered oversized, relatively straight backed GSDs.  Does anyone know of any?  My current dog is now 6, and I am looking for a new puppy, but can't find any of his type - they seem to be breeding them much smaller these days.  Must be good temperament of course.

What ever type of GSD you purchase make sure the parents are hip scored . By your description you should be looking for breeders who advertise that they breed 'English type' GSD.
Archer