Even a gear exchange NPC would be nice. Maybe tie it to the goblins that already exist for currency exchanges.

Example.
I get Clerics Mitts, but want a Dchap.
Go to Gob.
Trade Cmits for Dchap.

Limit it to zone by zone exchanges, so Xarc with Xarc/Bastok with Bastok.

is a PITA farming through all these items with stupid low % drops only to drop them all when you are done because you don't have that job, or don't want that item.