I have 45 mm on the overall width of my current guitars (1-3/4", standard on many fingerstyle guitars in the U.S.)...but with a slightly narrow 37 mm as the E-to-E spread (center-to-center...or 1-15/32").
It's all about personal preferences, of course...
...and I am fond of saying that one plays the string-spacing (at the bridge and nut), and not the overall nut width...although fingerboard geometry *is* important.
I may go to 1-13/16" as the overall nut width on my next guitar (approx. 46 mm), but I will leave the E to E spacing the same (37 mm at the nut), as I like that width, but want more room between the E strings and the edges of the fingerboard.
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