I would recommend the Etrian Odyssey games! They are First Person Dungeon Crawlers made by the same company as Megami Tensei (Atlus), and IMO are really good. For the 3DS, Etrian Odyssey IV is more traditional, low-story etc. while Etrian Odyssey Untold has a story mode with fully voiced characters (I've been enjoying it a lot), but is supposed to be a lot easier :P you can also get the first 3 Etrian Odyssey games - they're all for the DS. From the same company you might also enjoy the Persona games - they're in the Tensei franchise, and are described as like... highschool dungeon crawlers? I don't know what that's like, since I haven't played them, but you could give them a try (if you liked Etrian Odyssey, Persona Q is the most recent and was made by its team)
Crimson Shroud also looks really good if you're into D&D, from the 3DS eshop.