Just a quick note. Tonight my guild on Grizzly Hills (new server) did Sarth and Naxx 25. Because we are a new realm our guild didn't have 25 players so I was asked to bring all 5 of my chars. We still only had 23 players total.

We downed Sarth (Realm first x5), Anub, Window and Maex. I used a DK, Holy Priest, Boomkin, Frost Mage and Destro Lock.

Screenshots
Heroic Sarth (Realm First Title)
http://i47.photobucket.com/albums/f1...26/sarth25.jpg

Heroic Anub
http://i47.photobucket.com/albums/f1...526/anub25.jpg

Heroic Widow
http://i47.photobucket.com/albums/f1...26/widow25.jpg

Heroic Maex
http://i47.photobucket.com/albums/f1...526/maex25.jpg

Edit: In the Sarth page I am the five on your right.