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Never played a swashbuckler, but upgrading from a +2 to +4 headband of alluring charisma is 12000, or 14000 if you have to buy a new one and sell the current. A +2 DEX belt is 4000.
As a PFS player, saves are very important. 4000 for a cloak of resistance +2.
A Ring of Resilience is 15000 for a chance to remove a condition when you regain a panache. It could be really useful. (Again, I've never played a swashbuckler.)
Armor Class items start with armor, but your upgrade to armor would be 5000 gold, more expensive than a ring of protection or amulet of natural armor. It might be time to pick up one of them.
I second a ring of protection or an amulet of natural armor and the cloak of resistance.
I would also suggest a second weapon with different enchantments. For those encounters where the fire doesn't hurt the thing you are fighting. Like a cold iron sword if you might encounter fey or some demons.
Potions or weapon oils can generally be useful. With some creativity an immovable rod is handy.
You might want to buy an item to up your Dex. Since Swashbucklers aren't proficient in medium armor or shields, you need something to up your AC.