Given: You have interest in maximizing Blu, Blm, Nin, Whm, & Smn.
you immediately have made the AN earrings situational at best.
I personally chose the ethreal earring for the situations where id want MP back from being hit. e.g drg, pld
The AN earrings are highly situational at best for the jobs you have listed.
Example would be blm and blu magnetic for MBing. Hollow for NIN on Jin, Ethreal for when taking hits on blu or blm.
Its claimed that hollow is the best earring for many jobs like drg, war and mnk for dding. While this is true I personally just rely on diablo's earring or minuets or some such. For your NIN it will be a WS macro piece at best and then only be of any use if it helps you break a DEX tier.
Really from the jobs you have listed it doesnt really matter which earring you choose - you are very unlikely to see the full benifit of what the earrings give without leveling a new job.
75BLM 75PLD 75RDM 75WAR 75MNK 75NIN 75THF 75SAM 75BRD 75RNG 75DRK 75SMN, 75DRG 75DNC 75WHM 75COR 75BST 75BLU 75PUP 75SCH - # of summoner burns = 0 http://sizedd.freeforums.org/
Quote a few months before the mass salvage banning:
And stfu with the banstick, this is hardly traceable and so widespread throughout the EG community there's nothing SE can do w/o banning half the EG community on every server