Eldarion

[Amarie of the Vanyar]

There is no record of Dior choosing his kindred

Symestreem, that is because Dior never chose it, he was mortal. Only to Eärendil and Elwing, and their children it was given the right to choose.

Anyone know if Aragorn was longer-lived than the Kings after him?

I do think so, Olorin. It is implied in these words said by Aragorn to Arwen:

Nay, Lady, I am the last of the Númenoreans and the latest King of the Elder Days, and to me it has been given not only a span thrice that of Men of Middle-Earth, but also the grace to go at my will, and give back the gift.
The Tale of Aragorn and Arwen; Appendix A