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@pip
Yeah, if you have a symmetric Campy BB (such as some of the ACH ones or the Pista bb), your cranks will sit 1mm further out on either side. As most cogs+hubs tend to not give you a perfect 42mm chainline anyway, I seriously doubt you'll notice the difference.
111mm is worth considering just because its quite hard to find 109mm ISO BBs these days (and the prices can vary wildly).
I would personally buy a cheap ACH Campy 111mm BB (or similar), use that in the meantime and then sort out either:
1) A NOS 109 Campy pista bb
2) A Sugino 75 BB (109mm allegedly ISO but I'm still not 100% confidence thats its truly an ISO taper)
3) Phil wood - make a very nice 110mm adjustable ISO BB, which you could dial in perfectly
4) Royce BB - can make you a custom BB in almost any length taper
5) TA Axis BB, which I believe are ISO taper and come in a 110mm length.