It's not really an answer to your question, Mike, but I like the 150 Nikkor SW on 4x10 very much, and it should cover 5x12 well also.
Also, I have high regard for the Shen 4x10. The nice thing about it is that I have 5x7 and custom 5x8 backs for it. 5x8 is becoming my favourite format now, it's so easy to cut down 8x10 and shen will make up the 5x8 back for ~$300. (I got my 5x8 film holders from chamonix) In fact I am also debating asking Shen for a 5x10 back, a cursory investigation suggests to me that with the 150 it may work well on this camera with a 5x10 back and bag bellows. Just some extra stray thoughts....
Happy shopping!
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