If I wanted to introduce someone to Nevermore...
Well I would just sit them down in front of a huge stereo setup and play them all five albums one after the other. If it's not something they will get into then that's it is all, but if it's the other way around, once it's done, they'll be begging for more.
Personally though, I was introduced with Sound of Silence, and loved it so much I use it as the theme song for one of my roleplaying characters.