I like...
Saffron City
Hyrule Castle
Peach's Castle (64)
Mushroom Kingdom
Planet Zebes (64)
From Melee
Green Greens (with 64 music as choice)
Yoshi's Island (SMW)
Kongo Falls
Hyrule Temple/(or termina Bay w/swimming)
Corneria (w Sector Z background added as alternate Stage)
Big Blue
Fourside/Onett (I don't care which)
Zebes Depths
Brawl...
Tabuu's Destination/Subspace
Mario Kart
Warioware (with new microgames)
Snake & Sonic's Stages,
Spear Pillar
Fire Emblem's Stage (just so they have one)
Infinite Glacier
Other...G &W stage with new microgames
Pokemon Stadium 1+2 combined w/Mii audience
Classic Arcade Stage, Donkey Kong & Mario Bros. conbined in a stage that switches every 8 minutes somehow, with Pacman & Tetris added to the mix.