I think it would be good to start out with Mario, which makes it seem traditional.
*By other Mario, I mean the main theme to Super Mario Galaxy.
I chose other Zelda because I hear the overworld way too often. Perhaps Ocarina of Time songs, or even Wind Waker songs?
After that, the Pokemon battle theme. A classic!
Metroid music, which gives it a suspense feel.
And for the Grand Finale, the Game Over jingle of Mario.
All of these should be remixed, and given a different feel.
Is that asking too much?
EDIT: This stuff is copyrighted though, will it affect us?