Hi! I have a base iMac 27" 2017 with 16GB RAM and I'd like to upgrade it somehow. But I'm not that into hardware, so I don't know what gives me the biggest improvement in my work. I hope that you'll help me 
I'm mostly using FCPX (most of cases Full HD, but sometimes 4K too) and Lightroom. I'm thinking about change fusion drive and here is my question - It's better to buy 1TB SSD Sata (860 Evo or MX500) and small (128GB or 256GB) NVME with Sintech adapter or buy only NVME (bigger) and leave 1TB HDD? Or maybe buy 1TB Sata SSD and upgrade CPU to i7-7700K? I can't afford all of this upgrades right now, so I need to choose.
I'm mostly using FCPX (most of cases Full HD, but sometimes 4K too) and Lightroom. I'm thinking about change fusion drive and here is my question - It's better to buy 1TB SSD Sata (860 Evo or MX500) and small (128GB or 256GB) NVME with Sintech adapter or buy only NVME (bigger) and leave 1TB HDD? Or maybe buy 1TB Sata SSD and upgrade CPU to i7-7700K? I can't afford all of this upgrades right now, so I need to choose.
