I really like the animations by Emmanuelle Walker. He only has a few videos up, but what videos he has are rich in color and style. There is a rough, hand drawn feel to his world but a deep, real sense of space with it.
I also liked Tendril Design's animations. Their demo reel showed a great deal of high quality 3D motion graphics. The creativity and detail was mesmerizing.
Vladimir Shelest's portfolio I enjoyed for its imaginative sci-fi imagery. Many of his works, be it animated, stills, or ads have a very retro 60s space-age look but with a very new edge to them. They are rendered in very nice 3D graphics.