Some solid picks here, big up on the Breakage and Sci Wax pics above. Much as I like that Sci Wax thing it's a compilation and not an album though really. If label compilations were allowed then Platinum Breakz, Prototype Years etc etc etc etc
In terms of the album I've got the most use out of over the years I'd have to go for the Breakage LP, played every single tune on it out multiple times over the years and none of it ever gets old.
In terms of personal enjoyment and listening I think I've probably stuck the Second Sun CD on more than any other DnB artist album, such a warm satisfying listen, perfectly coherent, feels like a statement and a work of creation beyond just being a load of DJ friendly bangers. None of his other albums have quite had that effect for me, although if you took half of Even If and half of Condition you'd certainly have another album that stood up there with it.
So yeah, Second Sun or This Too Shall Pass for artist albums.