As the title says, I've got a late 2011 15" MBP, with 750 gb hdd and 8gb RAM. The HDD is almost full -- including about 450 gb of music files. The computer works fine more me (Internet, MS Word, iTunes), but my wife needs Powerpoint, Excel and Photoshop. She's complaining that it's too slow and her apps keep crashing. I do plan on getting a Mac Mini to use as a music streamer, so I will move the 450gb off the MPB. I'm not sure how much that will improve the MPB's performance. But we're considering an upgrade anyway. Am I correct that a 27" iMac (probably not the retina) will outperform an equivalently priced 15" MPB? We don't really need portability, because we will still have the 2011 MBP for travel.