I am thinking about upgrading my MBP dvd drive to a DL model. What is the best model, for the best price? Is there any place that might have a trade up/in option that will give a discount/buy your old single layer model for a purchase of a new one? If not can I use the old single layer model into a ibook that only has a combo drive? Other question I have is, I hear that Wireless N is faster and more reliable? Is this true? I ask this because I do heavy networking with other mac and windows pcs and speed counts. Now if this true, are there wireless N upgrade that is internal and not a express card slot based? Also, how would an N upgrade work will OSX automatically detect it, or do I have to do something to support it? Thank you.