Im looking yo buy a new MPB, however note that I rarely buy the latest models, rather the previous generation or older. So my research tells me that the MD322LL/A is from late 2011 while the MD103LL/A is from mid 2012. But for some reason I keep finding the MD322LL/A costing more (except here, shown below). So which one is better? My primary use is Adobe Lightroom and Photoshop CS5. I see subtle differences in specs, but would I really notice a difference?