I have "Moria Expeditionary" on my Dwarf RK main pretty much most of the time.
I would love to get the "Seeker of Khazad-dûm" title, though. This was a GameStop preorder code, and in my view, far better suits a Dwarf. Hopefully SSG will reintroduce it again for Extra Life or something similar, as they have for other exclusives.
I do like "Wandering Vault-keeper" (From the Buried Treasure event) for an RK as well, it just fits so well, imo.