Hey, I am looking to get a 13" retina mbp. I've been considering the late 2012 but upgrading it to the 2.9ghz i7 processor. I'm happy with 128gb SSD as most of my stuff is always on an external drive. I'll be using it for Lightroom and Photoshop mainly. Nothing too intensive but the occassional batch processing of actions in PS. Now and again I'd like to be able to do a bit of casual World of Warcraft too, but I'm not too fussed about turning down the resolution and graphics to get an acceptable framerate. Can anyone advise me whether I'd really notice the difference between the 2.5ghz i5 and the 2.9ghz i7 for this kind of use? This being probably the most expensive thing I've ever bought - I want to get it right.