Hello! I am considering purchasing an iMac primarily for video editing. I am extremely amateur and only plan to do this in my spare time. I own a GoPro Hero 5, but I do not shoot video in 4k. I plan to use both Quik and Adobe Premiere CC to edit and want a machine that can manage these programs easily. (My current PC is from 2012 but has 8GB of RAM and still can't provide video playback in either of these programs.) I am considering purchasing the 21.5" iMac with Retina 4k with 3.0GHz. My primary questions are: 1. is it worthwhile to upgrade from 8GB of RAM to 16GB? 2. Is a 1 TB fushion drive more worthwhile than the standard 1TB Serial ATA Drive? 3. How much video memory is necessary, if any? I've researched on plenty of sites but most seem to be for more serious professionals, so I'm a bit stuck. I'm hoping to buy a machine that will easily last 6+ years that will be used almost exclusively for this purpose. Thanks in advance for your help!