Aeolus- What, I'm not allowed some wishful thinking, even if it's a little "pie in the sky?"
I'm definitely with many of you about music. With the Grandia games, I found myself loving and remembering the battle themes, but almost never the dungeon themes. Grandia 2's final boss music is one of my all time favorite final boss themes. The boss music from when you fight Mareg is excellent. Though my favorite boss music is from Grandia 1 when you battle Nana, Saki, and Mio simultaneously. It combines my favorite battle theme from that game with their whimsical theme and it's killer.
Grandia Xtreme may have been a meh game, but I agree with you folks that it had perhaps the best take on the Grandia battle system. Oh, and anything over "spell grinding" any day.
As for the topic at hand, I already said what I'd want in a hypothetical new Grandia game.