Well for your first question, Super Mario Galaxy is gonna be awesome,
Check this out,
YouTube - Super Mario Galaxy for Nintendo Wii For your second question,If you havent played Super Paper Mario,Then your Darn Bloopin', Cuz that Game is a mixture of Super Mario Bros and Rpg elements, its awesome, and you get to switch from 2D,to 3D
, that is the best game out on a console right now