The book is great. Now you'll get to see all the great cards that never come up for sale.
I do the opposite of what most OJ collectors do. I don't care who or what the player/team is. If I see a card with a nice photo and I can afford it at the moment, I'll buy it. It's been a great way to collect the set for me. All of my cards have uniform photo quality. I'm afraid that if I start collecting a specific team, I'll start settling for lesser quality just to get a card I need.
It depends on what kind of collector you are. If you feel like you need to complete something, don't collect my way. I'll never complete anything, but over the last four years I've put together a nice looking group of cards without spending that much.