I'm looking to upgrade from a MBP 13" to a 15". I wonder if I should go with the lower end or higher end. As far as I can tell, everything will be the exact same, except for the processor. The lower end is 2.0GHz and the higher end is 2.2GHz or can be upgraded to 2.3GHz. I'm currently planning on getting: 2.0GHz Quad-core Intel Core i7 8GB 1333MHz DDR3 SDRAM - 2x4GB 750GB Serial ATA Drive @ 5400 rpm I use my computer for everyday tasks like Word, Excel, internet, lots of downloading, music, movies, etc. But I also do a lot of Photoshop and occasionally some video editing. What exactly does the processor do? And what would the difference be in 0.2/0.3GHz? Money is a bit of and issue, so I most likely will not go for the 2.3...but there is a slight chance I'll spring for the 2.2 IF it seems to be worth it, though I'm leaning to the lower end. Any advice would be appreciated!