I love binder books, been using them for a few years when it was really hard to find them. I rarely do 2pagers so the gap between the rings do not bother me.
I mix up the page sizes in the binder too. I also use the Bazzill 12x12 lickety split 4x6 photos to hold extra photos. I see the store does not carry them but they are called Lickety Splits.