You want resists for sure.
https://wiki.project1999.com/Shawl_of_Protection - Best item in the game for all classes IMO. Nothing beats one item that has like 4 items worth of all resists, especially in an off-slot like shoulders.
Shawl of Protection will be somewhat expensive DKP-wise though.
Don't spend too much DKP on items in slots you are going to swap for resist gear. Rings, Earrings, and Wrist items come to mind. Even really nice raid rings like Ring of Destruction only have 5 all res, compared to 8 all res from the player crafted rings. I am not saying you should never get something like a Ring of Destruction, but that should be one of the last items you get.
Get the PoM resistance Flowers as well. Having +50 to any resistance you want is great. Especially since you may get dispelled while pulling.