Need help choosing next color...

Well, I think it depends somewhat on whether you want your bags to match (which will blend in with your outfit) or stand out and make it's own statement. Since I wear a lot of neutrals (blacks, browns, beiges, etc.), I sort of like the idea of having a bag that would add a little 'pop' to my outfit. I think the blueberry will look great with a lots of colors (perhaps not green or purple), but it will definitely work with brown, beige, white, grey and black. Hope that helps!
 
I agree with everything Tkgny said about the blues, and I must add that Cornflower looks beautiful with chocolate-y shades of browns. The Cornflower also works with blues in the same family as itself, but it can get a little lost if I am wearing jeans as well, a little too blue : )

I wish you well,

Bridget