I have a chance to buy a late 2015 27" 5K iMac locally, and I was going to get a new one with an SSD for speed- PRICE IS NOT AN ISSUE HERE, it's more about getting a machine sooner as the Apple store is so far away, and I'm on a jobsite where I can't have stuff mailed to me. Does anyone know first hand, is the Fusion drive that much different than an SSD in the normal use of things like browsing, YouTube, and using iTunes? Will I notice much of a difference if I have them side by side? Thanks in advance if anyone happens to be familiar with both. I don't care about the plus and minuses of storage, I won't use much storage.