Probably Destiny and Eternia, since they're actually in English but I haven't played them. Plus they both have things I like from what I roughly (and probably incorrectly know). tragic magical swords!? made-up language?! hell yeah

Rebirth and Hearts for non-english releases. Since Rebirth seems interesting and Hearts was fun for the hour-ish I played stumbling with no Japanese.

Also the other two Radian Mythology games. The first one was fun (but i don't think i could go back to it now...)