Just a couple suggestions.
Super Health to Chest for more HP
Agility to cloak for added armor and avoidance.
Frost Talent Changes:
Drop Scent of Blood and Morbidity.
Max out Bladed Armor, and pick up Acclimation, preferably 3/3 (requires dropping Epidemic from Unholy as well)
Replace Icy Touch with Howling Blast unless you use a two disease rotation.
Otherwise, looks pretty darn good.
...Thoughts of a philosophical Death Knight...
If death is the inevitable end of life, is life the inevitable end of undeath?