Help me choose a violacea!

[cavycat]

Hi, I've decided to buy a blue violacea even though they're prohibitively expensive here in Europe. So I want to get this right. These are my options:

violacea July 4th x Gaston Bleu
violacea Blue Chip x self
violacea Bonnie Blue x Blue Beard

Which are most likely to bloom blue? I'd hate to spend a bunch of money on a magenta.

Thanks