Looking forward to KH3D though I need to play BBS first still. I might get Theatrhythm too, but I'm worried it might damage the screen some. I might be worrying too much about that, but I'm really cautious with the DS/PSP/3DS screens.
It's a touchscreen, dude. Don't ignore games because you are scared your touchscreen will be touched too much! In 3 years, your DS will be hiding in your closet, so get the most out of it.