Hi. I have a 2009 iMac that is outfitted w/ 8GB RAM and a 2TB drive that i bought refurbed and runs Yosemite pretty well. Generally I'm satisfied. But I just inherited an early 11 macbook pro with a HD that is about to die. (i tried to do a clean install and the drive is so broken, it won't let me. It only takes you to the startup menu's where you can use limited safari). Plucking around i noticed that it would support up to 16GB of RAM and also a 1TB Fusion drive. Basically $200 and you get a new laptop. Just before getting this laptop, i got an Air, so I don't need it for the mobility. My question, then, is basically whether for 1. longevity, 2. speed, 3. upgradability, where i would end up upgrading the macbook pro is far and away better than my current iMac. My wife likes using a desktop, so, the Macbook might live a life mostly folded up, connected to a monitor and external keyboard and mouse. So, I would sort of be getting a tower. Thanks for any responses.