Hi boys and girls, I posted a message last year about the Macbook Pro in the end I didn't get it, due to limited finances. This year I am definitely(probably) buying. I was drawn towards the 13inch Pro with retina last year, then I realised that Iris is not that much better than HD5000 is this what causes the "lag" what you are discussing in these forums? Do you often hook your laptop to an external display? I never really considered doing that with the 13 inch as you would still have laptop performance when it came to processor heavy tasks? and is the Air more practical than the 13inch pro when hooked to a monitor quite often? the 15 inch models are obliviously quite a bit dearer but to gain quad cores and a modest dGPU in the high end model seems like a fair trade off. does having the Iris pro help run the desktop better than standard Iris? I am doing Web and Mobile development so I think the nicer screens of the retina models are probably worth it I just don't know which one to go for? I know I won't really need the ram of the larger models. I might do a tad of 3d animation, will the new OSX be designed with the current models in line?