After a lot of thought I managed to purchase a title model 15" 2012 Retina with 16gb ram 768 GB drive and the nvidia 650m brand new still sealed (I know ). After pricing up an Air using my educational discount with i7 256gb 13" this was effectively £300 more. I couldn't justify the extra £600 which would have been more than £900 over my original budget for the latest 15-inch: 2.3GHz with Retina display. The reason why I was looking at the air was next year I would be upgrading and this would be passed on to her replacing her MacBook Pro 13" i5 2011. So now she will be getting a lot better machine which will hopefully last longer. My question sorry to tell a story here is the model I got better than the current base model 15-inch: 2.0GHz?