Just got my SK to 90 the other day and looking to upgrade my armor. Currently in some Blood-Etched pieces and other random finds from the Bazaar. Buffed I am at AC 1835, HP 60k, ATK 1954.
I don't know if you're only going like raid gear or w/e but remnants of tranquility are a lot cheaper on FV compared to even the normal gear drops, I calculated like 2600 pp for level 80 gear vs 25k for abstruse, ignore this if you're rich with millions to burn.