This is the shot everyone wants to get one day... the setting (or rising) sun lighting up the mountains in the back while the mountains in the front are still dark, and photogenic clouds overhead! Love that peachy color. I wouldn't be able to NOT try hdr just to see what it would do...although this is a keeper just as it is.
Stunning picture. it's curiously split into two main viewpoints
1) a calming view of the sundown which is like an announcement of a favourable day next
2) a dramatic scenery
If I can suggest, I would use the HDR which obviously by tone mapping the overall scenery will give a more dramatic view.