I love AC D-Rings!! I will NEVER go back! There is lots of variety (see below)! There are FAR MORE colors, sizes, varieties, etc., than what I've cited below. Just search the Superstore here for "American Crafts D-Ring". Oh, and there are other brands, too, but I've only tried AC.
Also, the pages do sit apart (as in two-page spreads), but if it really bothers you, you can staple the page protectors together at the spine to keep them together. But I have found that it doesn't really bother me at all. The convenience of having them in a D-Ring album far outweighs any minor problem like that for me.
I highly recommend them!!