i like high quality sound, but i dont think it is by any means a necessity.
and on the subject of Halo, I like it, but i think its probably the worst of bungie's games. This opinion might not be entirely valid, since i havent played much of the single player, but I played multiplayer with 7 other people for about 4 hours, and it just wasnt that much fun. If you want to play a REAL classic game, go pick up one of the Marathons or Myths (besides 3, since its not made my bungie).
BTW, i blame Microsoft for this, because they bought bungie and forced them to bastardize what could have been an awesome multiplayer PC/MAC masterpiece, but instead became a mediocre (IMO) xbox exclusive (for the time being).