I like the foam tape and bulky embellishments, so I like 35 pages in my book.
Maybe you are a chronological scrap booker, or your book is for a particular event, such as a long vacation. You might not be sure how many pages need to be in your book. Using a D ring binder as temporary storage until you finish your book is a great way to work. You can flip and move pages easily, and load the right number of pages into your post bound album the first time!
Any D ring binder will make a working album. Close to My Heart has 3 styles on sale in the clearance section for $17.50. Ruby Floral, Cocoa Damask, and black.