Just to fill a little with a few more thoughts.....
Keep in mind that some people have flatter pages and some have bulkier pages that will take up the space of a couple of pages. What one can get in album may not always hold true for another.
It will also depend on what your expectation is in regards to number of pages you want to put in a book! Although I am not a big fan of D rings albums I still can't get 300 layouts in there!
Although it will pain you at first to split an album if you still need to, in the long run it will be fine. It gives you a break in the middle to get a drink or have some cake!