The problem I have with parry is that it's nothing more but a %. On that same 7k over 7 hit sequence, you can parry all of them, just like you can parry none of them.
If you parry all of them, then yay, it's really freaking great, if you parry none of them, it's stat that are worthless and might result in a wipe in certain situation. I don't say "ignore totally parry" I'm just saying, hit those caps and leave it there. HP is reliable, you'll have them constantly no matter what, parry is not.
As for parry rating, you'll have a lot just by grabbing your gear.

Once fully geared, I aim for 415 STR (last cap is 405), 218 DEX (last cap is 211), 467 VIT (~7k7 HP with defiance in a party), 467 ACC (you need around 460 to never miss in coil), 493 Parry, 386 Crit rating, 261 Determination.
This is with Bravura +1, AF2 gear, 3 HQ DPS Acc (Neck/Ears/Wrists) and 2 HQ Tank Acc (rings) with two materia on each. After that point I guess I'll throw all of my money to meld even more, which will probably be 100% into crit rating.
This will allow me to hit all of those cap, have a reliable HP pool without ignoring the fact that a WAR actually needs offensive stats aswell since it's our own form of mitigation.