So my friends who are Vista users are playing Halo online. I was thinking of playing along, but I need to choose between Fusion or Parallels. CrossOver is not an option since I was procrastinating on installing Windows anyway and I need it, not just a single app. So for playing light games, like Halo 1, which VM should I buy? Which one will do it better? I'll be using Windows XP SP2 instead of Vista, which my friends use.