Etrian Odyssey is fairly good, especially the third. Also, before Kahunaburger (I think I got the name right...) gets here, may I recommend Devil Survivor?
DS is a game for the DS, where you summon demons (Demonic Spirits, or DSs, if you will) using a machine that resembles a DS.
...'Kay, random silliness aside, it's a tactical RPG that, while somewhat brutal on the difficulty (thanks, Atlus) is very entertaining, strategically engaging, and comes with an amazing plot. Also, more choice than I've seen in any game before, story-wise, with the possible exception of Geneforge. It's pretty amazing. For bonus points, they clearly did their research on all the myths they constantly make use of. It's pretty incredible.
Yes, it's an RPG from Japan. Don't let that deter you. This is from the company that invented moral choices in games and players influencing RPG stories, as far as I know.