Just a friendly note to all those making gearswaps and guides, some of these fully augmented UNM items are now BiS for some sets. I recommend getting your hands on them. Some even open up more versatility for various jobs. Sangarius +1, for example, makes a fun DW DRK or WAR with OP Savage Blade. Some items I recommend augmenting:
Sangarius +1
Caoethic Ring +1 (BiS Acc. ring)
Metamorph Ring +1 (BiS M.Acc.)
Lugra Earring +1 (a MUST)
Kentarch Belt +1 (usefull...but not essential)
Grounded Mantle +1 (BiS for Full Acc. Cape)
Pukulatmuj +1 (nice offhand for non-REMA, DW Crocea RDM - sword enhancement focus)
Cohort Cloak +1 (situational, but nice stats)
I'm thinking about Macabre Gauntlets +1 for MDEF/Status Ailment resist set
There is way more actually, but first some more about above options:
Metamorph Ring +1 - I dont think its only bis macc, but also bis damage for nukes (including BLU). Also bis or very solid alternative for many INT and MND based WSs.
Kentarch Belt +1 - what do you mena its not essential? Its bis Rudra piece at least, so its as essential as other bis options :P
Cohort Cloak +1 - Also bis for few things excluding hardcore DM augments
Now what else:
Acuity belt +1 - bis macc for many jobs
Aurist's Cape +1 - bis macc and hybrid acc/macc
Gelatinous ring +1 - one of the best -pdt/hp ring and bis Upheaval
Ghastly Tathlum +1 - bis nuking ammo for NIN and probably also for Helixes
Odnowa Earring +1 - bis -DT earring
Sailfi Belt +1 - bis for many WSs like Fudo, Expiacion, Savage, etc.
Seething Bomblet +1 - bis for hybrid sets based on Odin's armor needing haste. probably bis for several WSs like Resolution for example
Unmoving Collar +1 - bis HP neck
Alhazen cap +1 - bis acc/racc head?
Blistering Sallet +1 - bis for few crit WSs or at least competitive while providing superior acc
Hike Khat +1 - bis pdt head
Stinger Helm +1 - I think this one was calculated to be bis for some STR based multihit WSs at attack cap. Stardiver is one of them I think?
Asteria Mitts +1 - bis Avatar's magic burst piece I think
Gazu Bracelets +1 - bis Haste and acc hands
Lamassu Mitts +1 - bis macc for avatar
Demersal Degen +1 - IMO bis offhand for Savage COR
Jugo Kukri +1 bis evasion offhand
Ternion Dagger +1 bis NIN offhand for few setups I think. bis dps offhand for Carn BRD I think.
There is probably few more niche pieces out there and several above have more niche bis uses too.