It all depends on how much you wish to spend and how vast your collection wishes to be.
Monster Binders and Ultra Pro with side pockets are the best to ensure that your collection stays inside and won't fall out if you binder is accidentally turned upside down (which can happen.)
You can use cheaper 9 pocket style binders such as Max Protection and the cheaper Ultra Pro binders/albums. Personally I use monster binders for my collection just because they are durable and prevent cards from just falling out accidentally when going to events.
They are a good size and they can hold a vast amount of cards.