If you don't have a DVD burner at the moment I suppose you could go for a dual layer burner. Just know that at the moment the media isn't widely available at the moment. Considering the price of the media, I don't see any reason to upgrade from my single layer drive, but for you it would probably be worth it.

By the way, I don't know how good they are, but there are NEC dual layer drives on Newegg for $80 or $90.