I'd love to hop on this, but man, I loved Disgaea DS despite the downgraded (but still fine) visuals and audio. Simply put, having the level grid on the top screen made it so much easier for me to plan strategies for chaining explosions, throwing stacks of my party and general spellcasting and area attacks so much more convenient.
I'm positive NIS will port Disgaea 2 to the DS, though I haven't read anything (yet) about them officially doing so. Here's hoping!