Though I hate to say this, I would use 3M Sapphire blue.  I try to use Oracal when ever I can, but many companies seem to base their logo colors on 3M colors.
I have had the same problem matching 3M bright yellow.  Oracal does not make a good match so I have to stick with the 3M.  
I am not going to let a few bucks and a dislike for 3M make my colors "off" in the eyes of a customer.
If I was running Oracal, matching the industry standard colors would be a top priority.  Hopefully Oracal matches are in development.