Thats an open ended question. I would start with one of each. 24xl v, 28, 35xl digitar, 47xl digitar, 58xl or 60 digitar, 72 xl digitar and to finish off buy the 90 digitar.
I love the craftsmanship & am seriously considering purchasing a 12 SWA for photographing iconic super structures, bridges and interiors that can be corrected for perspective in camera. Any advice as to choice of lens would be much appreciated; my preferred format is 6x9cm with B&W film.