U dont need a tank spec. Just switch to frost presence and u can tank with any spec.
I would go two hand frost for PvP because it provides the most burst dmg when u have a short uptime on opponents.
I find this spec beeing the best:
http://wotlk.openwow.com/talent#jfVGZGMxtIrckbu0uzAoc
Use glyph of howling blast, frost strike and anti magic shield.
Dmg spell priority looks like this: howling blast>frost strike>obliterate>blood strike
Spam chains of ice if a enemy tries to kite u.
For the palys i would try to get the t10 two set bonus. its extremly powerful because it makes u able to spam divine storm for massive aoe dmg and heal at the same time.