I've considered the same dilemma and after acquiring blue marine box and indigo fjord bags, I still think I want a lighter blue as well, like the brighton. I love the purplish undertones orchids mentioned. (What a stunning blue sapphire Birkin, btw! I always love seeing it )
I have a request in for indigo box birkin or brighton blue chevre....they weren't turned down, but no word on them yet. I found a blue marine box Birkin and 32 HAC from a trusted reseller/friend, and grabbed them. Pictures below. I don't have a pic of the blue marine box birkin in action, but it looks great with all jeans (imo) because it's darker, it goes to the base blue color and holds the match. Here's a pic of the blue marine box HAC with a couple shades of blue clothes.
I think brighton blue could be more hit and miss, like blue jean...depending on the shade of your jeans. But if you don't mind dark bags, blue marine or indigo is a sure winner imo - it covers all the blue bases well. (Also, the indigo is so dark, it can mimic black when necessary. )
Here's a pic of black box next to blue marine box for comparison.
Katel,
Cant see your pics!!!