Nice, they are my faves too. Although i also enjoyed ff12.love the final fantasy series, especially 7 and 9. i'm also into the persona (shin megami tensei) series- i enjoy the social sim aspect of the game intertwined with more traditional turn based combat.
never really got into diablo, or that style of game, so i can't really help you there...
finally some good RPG games! the graphics are better in fallout 3 but i liked the look of the original fallout games much better, it had a much more desolate feeling to it. fallout 3 was way too cramped for a post-apocalyptic setting.Baldur's Gate 2/Planescape torment are a very good story driven game. There's so much text in choices to make. Every role playing game should use those games as example to create their own storyline. Make a game like oblivion with a good story a la baldur's gate/Planescape and you got one of the best game ever made right there.
for those who dont mind dated graphics give fallout(fallout 2 also) a try.
you will see how empty and dull fallout 3 is in comparison(not counting the graphics here, but story) Fallout 3 beats Fallout in graphic(obviously) but the original fallout put the new gen fallout to shame with it's storyline and gameplay.