RABOTM is great and all, but Pink Floyd have so much other great material.
Ummagumma has a whole disk of solo projects from each meraber, and tracks like 'The Erabryo' from the Atom Heart Mother era show how Barrett's influence was being replaced.
Also, most of their albums have been recently reissued onto CD, like Atom Heart, maybe Pulse, Delicate Sound of Thunder?, and Momentary Lapse of Reason. This is just off the top of my head, but they're out there.