What should i get with the Droknars Key?

What is worth the most there?

not much imo, all pretty ugly. the staves are the only exception, along with wands since they use the unique staff skin akin to brohn's healing staff/ kephet's refuge and not available elsewhere.

If you are thinking of selling something, the best thing is to sell the Droknar's key itself.
None of the items are really worth more than any other since they all come from the same place and are gotten the same way.

I agree that the caster staves are probably the best bet. They can have up to +60 hp which would nicely offset running a sup rune on a caster.

If I remember right, the Wands tend to be 20/20, which can be quite useful depending on your build/s.