Esmenet
I liked BFK's comment about surviving the encounter.
Also, I don't know why, but Mothers of that age seem to really be into me, so I'm sure I'd come out of it with a minor Fiefdom or something. Besides, despite being one of my least favorite characters, she had a pretty great view of the happenings-on throughout the last few decades.
Though if Serwa promised not to kill me or otherwise manipulate me into a stupor, she might answer some useful questions.
But also Thelli! Thelli is awesome. Maybe her. Maybe Esmi and Thelli together would make for a nice dinner gathering filled with interesting conversation.