The number that for me will always be their best is "Fires at Midnight"- it's the song that made me become a fan. The whole mystical atmosphere they create with that song is wonderful.
Besides that, It's hard for me to name what other songs I consider "their best" - I really like "Faery Queen", as well as "Play Minstrel Play".
Anyone here ever been to one of their "castle tour" shows? I've attended 2 of them in Germany, and, IMHO, there's no better way to experience their music then them playing it live in the courtyard of an old castle.
Tact? What good in tact? I've tried that on people, and they still don't do what I want!