[Taqwus]

Depends what you're up against. MR, prot or other resistances would probably be more valuable unless you're absolutely mobbed by cold-susceptible weak squishies, 'tho, and in such cases a Charcoal Shield or *eek* Bone Armor (but watch the prot if you go this way; easier choice if you can cast invulnerability, have a very high base prot, or wear the extremely lovely, if cursed, Amon Hotep) might make more sense.

'course, the rime hauberk IS easier to get...