The frost emblem cloak is close to BiS, and so is the belt. Looking at your gear, I'd get the cloak, then get the belt.
Gloves you might be able to get some nice one drop from Voa25, so I'd do that until you save up more frosties.
You could also probably use Rimefang's claw from PoS-H, the Splintered door shield from HoR-H and The black heart from Toc-norm. Just my opinion.