Death Valley is such a colorful place that it is easy to get stuck on the question of color vs. monochrome.
I like both versions, but they are very different pictures. I agree with Terry's suggestions for the black and white version (his critiques tend to be spot on).
After my own one visit to Death Valley, I went back and forth between mono and color on many images, and my own favorite shot at dawn looking left at Zabriskie point ended up as monochrome. I'll post it soon on another thread, so as not to hijack this one.
Eric