I want to buy an DVD recorder, but I am a little confused. Please ask to these questions: 1. What is the best choice for DVD video: DVD-R or DVD+R? 2. If I choose DVD-R, how can I know if the burner make DVD-R General or DVD-R Authoring? 3. I want the burner especially for DVD video. The Sony DRU500 is the best choice or Pioneer DVR104/103 is enough? Thank you.