I am soooooo new to this so forgive me if this seems a daft question. I just bought the NEC ND3500A dual-layer burner and Im wondering what the difference is between dvd-r and dvd+r? Also which media do you experienced mates use for burning copies of your fav movies? I hear that Verbatim is best or Ritek, but do I buy the 2X? the 4X? the 8X ?