You should just pick dps stats, tanks now utilize those for defense. As been said, get a lot of sockets, get Shadowmourne if you are a DK or hope you have the heirloom 1hander that dropped off Garrosh (Hellscream Doomblade iirc, it has 2 sockets) and also the heirloom shield (another 2 sockets).
SoO sets can be interesting, depending on class (for example Shadow Priest set boosts Mind Blast a fuckton, so it's a really good set for dps), also some trinkets do scaring amounts of damage.
Here is an interesting spreadsheet, for all classes, it may not be perfect, but it gives you an idea of where to start:
Timewalking BiS - Google Sheets