If you know any crafters, melding vitality and Parry to i70 STR/DEX/Acc jewelry is pretty huge and relatively cheap, especially if you're going for the Noct Hoplon (which benefits more, defensively, from high str/dex/parry, than kite or small shields).

The most expensive part of making the jewelry are the 9 pieces of dungeon drop/FC seal items you need (animal fat for everything but the earrings, and peacock ore for the earrings). If you've got maxed out seals, that's enough for two pieces of jewelry, and the i70 stuff is so trivial to HQ that an FC mate that's leveled and geared the appropriate crafting class should be willing to do it for cheap or free if you get them the mats.

Melding the jewelry can be time consuming and expensive, though, depending on how overmelded you want to go. But if you've leveled the class yourself, you don't need the gear or cross class skills you'd need to make the thing.

If you fully overmeld only 1 piece with vit/parry, go with the choker. That'd be a much better piece for a tank looking to hit the accuracy cap than the Allagan choker, and if you view skill speed as pointless/detrimental, the only other options for pure tanking gear end game are really the ribbon and HA choker, or spending a small fortune on an i90 crafted choker and all of the III and IV materia you need to make it competitive with the Allagan choker, let alone better.