I can't choose between Ready To Die and Illmatic. Both perfect.
I'd put Blueprint up there too, I like it a little better than Reasonable Doubt. And good pick on The Infamous, though I think Hell On Earth is just as good and really underrated. P was a beast back in the day
Doggystyle and Enter the 36 Chambers...I probably only choose these because they were my formal introduction into Hip-Hop. I was 9-10 when both of them dropped. I don't have a favorite album, my favorite rapper is Jay-Z...but most Hip-Hop albums are too inconsistent content wise and sonically to me in an attempt to get Mass Appeal (No Pun). That's probably why I list those 2 albums as well, because of course they are mainstream commercial albums, but both Artists were just doing what more or less came naturally to them at that time.