Sacred odyssey, zenonia,final fantasy II, chaos rings, orebuster, those are all fantasy themed, galaxy on fire 2 is a decent space themed rpg, lots of quests..
I second Battleheart. You can pick up the iPhone version of Final Fantasy 3 or wait for Square to release the ipad version. They have said they are working on it, but no release date. They are also working on FF Tactics for iDevice that was delayed last year so should hopefully come out this spring/summer.
I worked on the environments for Dungeon Hunter 2 :D It's definitely not the deepest RPG, but if you're looking for a Diablo-esque game you should like it :) I'm thinking I'll buy Final Fantasy 3 sometime soon here. If these more expensive games do well we'll start to see more quality games.