On Windows I'm addicted to Altap Salamander. I've tried a couple of OS X alternatives, e.g. Midnight Commander. Yes, they are better than plain command line or Finder, but can't compare with Altap Salamander. Besides the normal commands known to Midnight Commander, I also miss directory bookmarks or directory history.
An acceptable tool does not have to look like a good Mac application — I'm searching for something powerful for keyboard-centric file management.
Can you please share your experiences with other NC clones for OS-X?