dark blue.

How good are you at even bindings and neat corners? If you're a stickler for really tidy, precise binding work, then I think the dark fabric would be nice. If you're still learning, or you don't really want to invest the time in making the corners perfect, then I think that you're better off with a match to the border. My observation is that bindings are among the top problem areas where quilts fall into the "loving hands at home" category of crafting. I've learned not to make a showpiece of them unless I really intend to do it right.

Personally I'd use that red or the pink print in the lower right.

Dark absolutely.

just to add my HO to the mix: whatever you do will be wonderful. Personally, I like the binding to match the border so that the center of the quilt is the focus. Also, the binding ends up hanging off the bed anyway, so it only frames the quilt when it's laid out flat or hanging. Gorgeous quilt and love your colors! Do share what you end up doing.

I like the dark blue as the sashing and floral for the back

I like the dark blue, it brings it all together.

I agree with Pamela. I think dark pink would pull both sides together. Very pretty quilt and I really love the floral back.

I like the dark blue. It frames your blocks and should frame the entire quilt. The florals would be lost in a binding.

Definitely the dark blue!