Cerb: Rare, but we have blms help stun..though I can RDM/DRK so I guess Cerb is moot. Khim on the other hand we use BLM/SMN/RNG DD's mostly..BLMs dont do too bad if they have good gear.
I have Nashira Feet, but not the rest. I am going to be working on getting Snow Rings, but atm I only use Diamond Rings. The gloves I am going to be working on, but our shell doesn't do Temenos so I have to lowman it (easy if people actually decide to go) to get my temenos pieces. Witch Sash I will have soon enough. Merciful cape..slow slow work in progress. Relic I can get pretty fast..I don't need anymore dyna gear for my jobs that isn't freelot stuff except blm body/head..and almost everyone in my shell already has..so it's just a matter of time.Change balrahn's to snow, get an elemental earring, hq your AF gloves asap, ice grip->bugard, and consider oracle's->errant if you're still getting resisted frequently. Sorcerer's Petasos, Merciful Cape, Witch Sash, and Nashira Crackows help, but I assume you don't have any of those.
I was mostly trying to gear myself out for pre-relic/HQ upgrades until I can get said pieces.