Im thinking about replacing my 4x super drive with a new dual layer dvd burner. I have a few questions. 1. will my g4 1.42DP be able to handle the dual layer burner? 2. I am assuming you can still burn the regular -R 4.7 DVDs? am i right 3. Are the dual layer DVD-Rs expensive still? 4. What model do you recommend if I can go ahead and put one of these bad boys in my sweet G4. also can you only burn dual layer +R's? Thank you very much.