unrarX is quite inconvenient with passwords. It happens on some installs that the enter password option is nowhere to be found. It is just not there. I found I wasn't alone with that problem but nobody seems to have an answer. Took me a while to figure out who to open a pw protected rar without getting into the terminal.
Now I just use The Unarchiver works flawlessly. I also use the Pathfinder in exchange for the finder and it uses stuffIt by default, that one has a very poor progress display.