While waiting on this year's refresh to purchase my first Mac, I'm beginning to wonder whether I should buy an iMac or a Retina MacBook Pro. Truthfully, I don't need the portability of the MBP—my iPhone 7 Plus will accomplish most of what I need to do when I'm on the go, but I have a lot of trouble sitting for extended periods of time. So do you lot think that the power of the iMac line is powerful enough to warrant the stationary nature of a desktop computer? As an aside, is the Fusion Drive really worth the extra $300? Thanks.