You bought a DS, hoping that'd Earthbound would come out for it? O.o;
There are plenty of awesome games on the DS, it's just what you prefer, really. If you want to emulate PS1 games and play some racing / fighting games, then get a PSP. If you want some all-round fun games (imo) like Mario, RPG's, GBA games, and intuitive games, then the DS.
And if you want to watch movies, get a DVD player; if you want to listen to music, get an MP3 player.