basically working on
homam (3rd on the list)
Legs and hands(though you can get Askar Manopolas instead) are priority for you, boots are nice too, but you can ignore the rest, don't be scared by Omega it could be kill with 8-10 people if your group know what they are doing, in the same sense, 4-5 ppl can farm every apollyon area
The main thing here is the body, and even that is at risk to be deprecated by the iron ram still unreleased body piece, other stuff is more for /ja macros (valor looks awesome but that's a different history)
This could be your priority now, is very good not just for paladin and bring some friends for a run isn't that hard.
Good but it require other pieces to work well together(like cerberus or resentment) to swap for enmity, if you don't have either of those is better just to stick with high breath mantle.
One of those pieces with PLD graved on them, the additional effect is pretty significant during long battles(even more if you are blood tanking) and can't be replaced by any other piece
I feel next to cassie is just a side grade, it isn't bad but the real gear for this ear is hades(+1), however it's very nice to macro for spell casting.
Iron Ram gear
Very very good, no just the enmity but the elemental resists and the magic defense bonus, make of this set a great investment for paladin.
very good on the way to 75, with situational uses in endgame.
Blood tanking and shadows down moments are good times to wear shield torque, however you should consider also parade(refresh) and harmonia/ritter(enmity)
I haven't heard of this item, either is registered in any ffxi site, could let me know where did you hear about it, and what are the stats on it.
At last but not least, the stickies have some nice guides for equipment and pld/nin, pld/rdm strategies, take a look at them I'm pretty sure that you will find useful information.
I hope it helps.