ok guys, i tryed to google it, read some posts in official forums, but i couldn't find any serious info or grown-up answers about that. I think that here with You i can find the right answer -

- What do u think will be the best choice for Death Knight first for PvE and second for PvP in the current circumstances with the racial skills?

im gonna play with DK mainly PvE (i dont play pvp, only battlegrounds if i dont have what to do). Im rerolling from shadow priest, everybody knows why :(

They can tank with 2handed weapons and they got heavy dps while they r tanking :) thats nice..

I think warriors are still going to be #1 main tanks to (: About the best PvE race for DK's, i'd go with tauren, and orc, undead or nelf for PvP.

I think

Aliiance: Night elf for tank, Human for dps
Horde: Tauren is for tank, Orc for dps

Actually if create new character for DK class i think Human is best.
or Tauran(Horde)

my opinion that for horde is will be troll DK as the best in PvE for it's racial (+10-30% attack speed)

P.S. imho also it's quite funny) just think "troll DK" =D