I have and sunset in the winter or spring can be really nice. The Sangres glow pink, especially with snow on them.
That is what I am thinking- Sunsets will be best due to the Sangres blocking the sunrise. Unfortunately the NPS webcam is not showing too much snow on the Sangres. Found a NPS brochure that gives some basic photography tips:http://www.nps.gov/grsa/planyourvisit/upload/photography2012.pdf