I do a lot of work with a 6x7/6x9cm technical camera in B&W and my 65mm f5.6 Super-Angulon is almost always my preferred lens for architecture and landscape work. Bear in mind that on this firmat the image circle is effectively huge - easily 50mm of shift - so if you are using a rigid camera it is not even trying. For extreme shifts a centre filter is a good idea, but for more moderate use you can get away without most of the time.
My opinion - a very good lens, but if you are not going to shift then you can probably get away with something cheaper.
I'm in the UK, so can't comment on Canada/US prices I'm afraid.