1. Fury, TTW, Combat
2. Retri, UH, MM, SP, feral, FDK
3. Demo, Boomie,
4. Assasin, Ele, Enh, Affli and all the weird stuff like Blood DK, Destro, some of these are "good" dps wise, but they are "obsolete" and replaceable with more useful specs in Raid composition, I guess that's the best way to say it. Maybe I forgot some spec.
Note that none of these specs will do any decent dps if raid is not properly built. Raid composition is King, you can lose spot to some 4th tier dps with your imba fury op daddy easily, if raid needs specific tool.