JIS / ISO BB - Does it matter?

Reet, I've UTFS and read all of what Sir Brown has to offer, but if anyone can give me a simple answer to a simple question, I'd be dead happy an all that.

Right now I'm using an old MIche road double with a JIS 107mm BB. The chainline is perfect, but the BB is a piece of shit. I presume the Miche cranks are ISO, so I might as well get a good ISO BB (campag centaur or something) to replace the current one. My question is thus:

What length of ISO BB would be equivalent to a 107mm JIS BB when used with ISO cranks?

By my calculations:

"If you install an ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length."

                                                     S.B.

So to get the same chainline, I need an ISO BB that is 9mm longer over all to compensate for the crank sitting 4.5mm deeper on the spindle. Vis, I need a 116mm ISO BB... is this correct, before I drop cash on a decent bottom bracket?

Thanks, and sorry for the resurrection.

Finally got round to replacing my shitty JIS bb with a nice campag one. My sums were good, it's perfect, and my drive train has stopped making intermittent clicks. Let this be a lesson to you all / anyone who is thinking of doing the same thing.