Titles - hard, rare, unique

[Cere06]

Greetings.

I was wandering the other day, what titles are considered as the hardest, most honorable ones and the rarest ones.
I would like to hear your opinion on it.
I think one of the hardest (in wotlk) is Bane of the lich king. And one of the longest no-life to make is Loremaster.

Which titles do you, warmane community, see as the best, unique, rare or hard?

Looking forward to reading your answers.

Cere

[Peregrine]

R1 Titles in pvp.
Flawless victor.jk removed with 3.2 (retail people know what this is!)
Death's demise!

And last but not least.,battlemaster/khan.