I have an outdated MBP (2009) and want to get a newer one. I use it mostly for work --- web/editing images but expect to occasionally need to edit videos as related to my job. I am looking at refurbished and it's between: Refurbished 15.4-inch MacBook Pro 2.0GHz Quad-core Intel i7 with Retina Display for $1659. This one has Iris graphics http://store.apple.com/us/product/F...-20ghz-quad-core-intel-i7-with-retina-display or Refurbished 15.4-inch MacBook Pro 2.3GHz Quad-core Intel i7 with Retina Display. No Iris Pro. $60 cheaper. http://store.apple.com/us/product/F...-23ghz-Quad-core-Intel-i7-with-retina-Display So, I guess my question is do I need Iris Pro for my purposes? I don't know much about computers but it looks like the processor on the one with Iris Pro Graphics is slower. Is that right? Thanks.