The ink is realy gorgeous, but I think you might have a hard time finding that color. I think Kirna Zabete had an ink city a few weeks ago, but it was very veiny and kind of dry (though you can find posts on PF about how to soften it up with Lubriderm). The ink is very dark and will look almost black in some light and purple in other light. It's a very interesting color, but I'm not sure I'd describe it as blue (to me it's more of a purple-black).
I just bought the blueberry yesterday (my first bag)! The color is a very vibrant and deep blue -- the color really does sort of resemble a blueberry! I bought that color because I was wanting something with a little 'pop', but that would work with so many colors (I tend to wear a lot of blacks, brown and neutrals) and it's really pretty and can be used year 'round IMO. A few posters mentioned yesterday that they thought that the leather on a few of the blueberry bags that they had seen seemed 'smooth and hard'. As a newbie to Bal, I'm still not sure what this means (mine seems to be pretty squishy and soft and not veiny at all -- but since I don't have any other bbags, I don't have anything to compare it to). The SA at BalNY told me that think the blueberry is their favorite new color in the store.
Soooooo, I don't think you can go wrong with either color -- they are both gorgeous. Good luck -- let us know what you decide!