I am getting ready to purchase a laptop and I'm curious as to whether or not I should get a new Macbook (13 inch, 2.0GHz, 1GB, 80GB Hard Drive, $1,299) or a refurbished Macbook Pro (15 inch, 2.0 Ghz, 512MB, 80GB Hard Drive, 1,349)? The Macbook advertises a dual layer drive. If this can burn...