I'm too lazy to link to Youtube videos, but here's some of my favorites:
The Wake of Magellan by Savatage. before the group morphed into Trans Siberian Orchestra, Savatage did some great concept albums. This one could easily swap places with Dead Winter Dead.
Selling England By The Pound by Genesis.
Duke by Genesis. Depending on my mood, you could swap in Wind and Wuthering as far as what's the best of the Phil Collins era.
Haunted by Poe. She only did two albums that I can see, but this tribute to her late father is incredible.
The 13th Floor by Sirenia. Narrowing it down to one particular album from this group is hard, but I find myself going back to this one again and again.