I don't really see many as all that prestigious, although I haven't seen anyone with The Immortal in a while now.
Honestly I think the best titles are the ones that fit well with the character names. Some of the people that make their names to fit with certain titles make me giggle.
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Hand of Adal, since after T5 raids only got easier.
Insane is pretty grindy to get, but nothing impressive, just a huge waste of time. Scarab lord of course is ultra rare, but it was more a matter of being there at the rigth time and getting picked by your guild and then again doing the huge grind.