I'm about amount away from getting my 1st Mac ever. But...I'm still deciding on which one to get. I think I'm going to get a 15'', but I'm wondering a discrete GPU would be worth it as it comands a $600 premium over a base rMBP. I'm a gamer, but I have an Xbox 360 and built a computer with these specs: (I'm waiting for Watchdogs to get the GPU) So I don't believe I need a GPU in the Macbook Pro. Now, I will probably do some programming and Photoshop work. Maybe even a little Aperture and Logic Pro. Will the Iris be good enough? Thanks!