Lyman would be 1st on my list. If you only use or plan on only using 1 brand of bullets get the bullet makers reloading manual. The problem with any just 1 book is that gun powder types get dropped and added, same with bullets. I end up getting most of them and replace most when newer editions come out.
For just load data, some of that is found on the net for free by powder companies. I keep a binder of published data besides the printed books for stuff I don't have. I am loading 16 different calibers, using many different powders and bullets. So, a bookshelf of data is what I need.