If you want to get some frost items before cata do it before the convertion.
Some nice dude posted this link in a different thread http://img199.imageshack.us/f/justicepoints.jpg/
694points for the trinkets, which i wanted to get for cata...but if i use the calculator i just get 165 for the 60 emblems i need to buy one now. Okay i get some points from triumph and they are easy to farm for my tank and heal chars but i would need 193 emblems of triumph + the 60 frost, so 253 since i dont have the frost emblems, means ~55 rnd hero instances...think i will just lvl with the stuff i have right now :/