Its going to be hard to find a mob like that for a few reasons. First, most (all that I've seen) named mobs that drop decent loot are tagged as group mobs (so they are tough), and not easily (if at all) able to be solo'd.
Secondly, once you are big enough to solo said mob, its grey to you, and you won't get a chest from grey mobs. Your best bet at your level would be to get a small group together and kill the named Scarab Beetle in the Crypt of Betrayel (his/her name starts with an 'A'). Drops some exellent loot, but like I said, by the time you are good enough to solo it, it'll be grey.
Hope that helps. As a side note, I do aplaud SoE for this. It was always annoying to finally get big enough to go and get your <insert random loot here> only to find someone who was 20 levels above the mob farming it for cash.