Hittite sounds mysterious, cool and elitist, plus is not as known as the rest of the ancient languages. And according to linguists, it actually doesn't descend from IE, but is more akin to IE's sister. Tocharian could be interesting too, as well as Sumerian.
(What I mean by IE's sister is the fact that there seems to have be, if I understood correctly, Proto-Indo-Hittite, which then diverged in Proto-Indo-European and Hittite.)
Bookmarks