Hi I Have a 1.8 GHZ imac and a 2Ghz Macbook looking to purchase a dual layer DVD burner. I Know - the new modles have them, but I have older versions of the macbook and imac. Anyway - I am looking to buy a burner. Any recommendations? I mostly use idvd -the latest version and I am looking to burn DVD's about 2.5 - 3 hrs in length. 1. Which Dual Layer Burner should I get? 2. Will idvd support it? Thanks for any advice.