Some of Rush's best work is post Moving Pictures. With Moving Pictures, they reached a pinnacle in one style of rock. That wasn't satisfying enough, so they set out to explore other avenues of rock.
I still say Clockwork Angels is their best, most complete album from beginning to end. Kinda like Moving Pictures with no duds on the album. I was listening to Snakes and Arrows today, and I'll have to say that is their most underrated album.