Its been awhile since i was leveling anything with Leves, but the way i remember it finishing and turning in a leve caused the list of available quests(and their listed rewards) to get reset. So when the one i wanted wasnt there id do one and turn it in, then check the list again and usually find what i was after. And maybe its just me, but i always liked that there were a bunch of different types of quests available and not just the same thing over and over.