Which secondary stats after 8.3?

[Deadguywalking 0]

Hi folks, recently began playing my old dk I retired at the end of wrath and oh boy have things changed since then...

What would be the preferred secondary stats for a frost dk nowadays? Mastery >crit >haste>versatility? 

I used to use 2 x 1h swords for pure dps stuff is this still the case? 

Thanks for reading this